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Contraceptive orale pentru durerea asociată endometriozei

Appendices

Appendix 1. Cochrane Gynaecology and Fertility Group specialised register search strategy

Searched 19 October 2017

Procite platform

Keywords CONTAINS "endometriosis" or "Endometriosis‐Symptoms" or "pelvic pain" or "dyspareunia" or "dyschezia" or Title CONTAINS" endometriosis" or "Endometriosis‐Symptoms" or "pelvic pain" or "dyspareunia" or "dyschezia"

AND

Keywords CONTAINS "Oral Contraception" or "oral contraceptive" or "oral contraceptive pill" or "Oral Contraceptive Agent" or "oral contraceptives" or "oral estradiol" or "oral estrogen" or "OCP" or "oestrogen plus progestagen" or "ethinyl estradiol + drospirenone" or "ethinyl estradiol‐cyproterone acetate" or "ethinyl‐estradiol" or "desogestral" or "desogestrel" or "Levonorgestrel" or "Norgestimate" or "Norgestrel" or "Norethisterone" or "noresthisterone" or "combined oral contraceptives" or Title CONTAINS "Oral Contraception" or "oral contraceptive" or "oral contraceptive pill" or "Oral Contraceptive Agent" or "oral contraceptives" or "oral estradiol" or "oral estrogen" or "OCP" or "oestrogen plus progestagen" or "ethinyl estradiol + drospirenone" or "ethinyl estradiol‐cyproterone acetate" or "ethinyl‐estradiol" or "desogestral" or "desogestrel" or "Levonorgestrel" or "Norgestimate" or "Norgestrel" or "Norethisterone" or "noresthisterone" or "combined oral contraceptives" (91 hits)

Appendix 2. CENTRAL CRSO search strategy

Searched 19 October 2017

Web platform

#1MESH DESCRIPTOR Endometriosis EXPLODE ALL TREES (536)
#2Endometrio*:TI,AB,KY (1507)
#3Dyspareunia:TI,AB,KY (616)
#4Dyschezia:TI,AB,KY (25)
#5(pelvic pain):TI,AB,KY 960
#6#1 OR #2 OR #3 OR #4 OR #5 (2656)
#7MESH DESCRIPTOR Contraceptives, Oral EXPLODE ALL TREES (3262)
#8MESH DESCRIPTOR Contraceptives, Oral, Combined EXPLODE ALL TREES (698)
#9MESH DESCRIPTOR Ethinyl Estradiol‐Norgestrel Combination EXPLODE ALL TREES (67)
#10MESH DESCRIPTOR Contraceptives, Oral, Hormonal EXPLODE ALL TREES (242)
#11MESH DESCRIPTOR Contraceptives, Oral, Sequential EXPLODE ALL TREES (32)
#12MESH DESCRIPTOR Contraceptives, Oral, Synthetic EXPLODE ALL TREES (2643)
#13MESH DESCRIPTOR Desogestrel EXPLODE ALL TREES (349)
#14MESH DESCRIPTOR Levonorgestrel EXPLODE ALL TREES (628)
#15MESH DESCRIPTOR Norgestrel EXPLODE ALL TREES (848)
#16(oral contracept*):TI,AB,KY or (contraceptive pill*):TI,AB,KY (2416)
#17OCP*:TI,AB,KY (160)
#18(ethinyl estradiol):TI,AB,KY (1390)
#19desogestrel:TI,AB,KY (534)
#20dienogest:TI,AB,KY (138)
#21levonorgestrel:TI,AB,KY (1218)
#22norgestrel:TI,AB,KY (434)
#23(estrogen* or oestrogen*):TI,AB,KY (10437)
#24(Progestin* or Progest?gen*):TI,AB,KY (2074)
#25MESH DESCRIPTOR Norethindrone EXPLODE ALL TREES (707)
#26Norethindrone:TI,AB,KY (807)
#27norethisterone:TI,AB,KY (731)
#28gestodene:TI,AB,KY (240)
#29MESH DESCRIPTOR Ethinyl Estradiol EXPLODE ALL TREES (1165)
#30MESH DESCRIPTOR Norgestrienone EXPLODE ALL TREES (33)
#31(ethinyl oestradiol or ethinylestradiol):TI,AB,KY (909)
#32#7 OR #8 OR #9 OR #10 OR #11 OR #12 OR #13 OR #14 OR #15 OR #16 OR #17 OR #18 OR #19 OR #20 OR #21 OR #22 OR #23 OR #24 OR #25 OR #26 OR #27 OR #28 OR #29 OR #30 OR #31 (14739)
#33 #6 AND #32 (527)

Appendix 3. MEDLINE search strategy

Searched from 1946 to 19 October 2017

Ovid platform

1 exp contraceptives, oral/ (47054)
2 exp contraceptives, oral, combined/ or exp ethinyl estradiol‐norgestrel combination/ or contraceptives, oral, hormonal/ or contraceptives, oral, sequential/ or exp contraceptives, oral, synthetic/ or exp desogestrel/ or exp levonorgestrel/ or exp norgestrel/ (31520)
3 (oral contracept$ or contraceptive pill*).tw. (27438)
4 OCP$.tw. (3803)
5 ethinyl estradiol.tw. (3985)
6 desogestrel.tw. (1152)
7 dienogest.tw. (397)
8 levonorgestrel.tw. (4445)
9 norgestrel.tw. (1143)
10 (estrogen$ or oestrogen$).tw. (154616)
11 (Progestin$ or Progest?gen$).tw. (18783)
12 exp Norethindrone/ (4456)
13 norethisterone.tw. (2066)
14 gestodene.tw. (801)
15 exp ethinyl estradiol/ or exp norgestrienone/ (11354)
16 (ethinyl oestradiol or ethinylestradiol).tw. (3066)
17 or/1‐16 (213655)
18 exp Endometriosis/ (21265)
19 Endometrio*.tw. (28025)
20 Dyspareunia.tw. (3573)
21 Dyschezia.tw. (250)
22 pelvic pain.tw. (8103)
23 or/18‐22 (40610)
24 17 and 23 (4578)
25 randomized controlled trial.pt. (497191)
26 controlled clinical trial.pt. (99259)
27 randomized.ab. (434049)
28 placebo.tw. (208224)
29 clinical trials as topic.sh. (195576)
30 randomly.ab. (299103)
31 trial.ti. (196021)
32 (crossover or cross‐over or cross over).tw. (80882)
33 or/25‐32 (1240442)
34 exp animals/ not humans.sh. (4679127)
35 33 not 34 (1143190)
36 24 and 35 (529)

Appendix 4. Embase search strategy

Searched from 1946 to 19 October 2017

Ovid platform

1 exp ENDOMETRIOSIS/ (32243)
2 Endometriosis.tw. (27961)
3 Dyspareunia.tw. (5918)
4 Dyschezia.tw. (466)
5 pelvic pain.tw. (12164)
6 or/1‐5 (47558)
7 exp oral contraceptive agent/ (57765)
8 exp ethinylestradiol plus norelgestromin/ or exp ethinylestradiol plus norethisterone/ or exp ethinylestradiol plus norethisterone acetate/ or exp ethinylestradiol plus norgestimate/ or exp ethinylestradiol plus norgestrel/ or exp estrogen/ or exp gestagen/ (312716)
9 exp dienogest/ (1013)
10 exp dienogest plus ethinylestradiol/ (124)
11 dienogest.tw. (674)
12 (oral contracept$ or contraceptive pill*).tw. (27835)
13 OCP$.tw. (4656)
14 ethinyl estradiol.tw. (3159)
15 desogestrel.tw. (1190)
16 levonorgestrel.tw. (5210)
17 norgestrel.tw. (732)
18 (estrogen$ or oestrogen$).tw. (170735)
19 (Progestin$ or Progest?gen$).tw. (19282)
20 exp norethisterone/ (6700)
21 norethisterone.tw. (1939)
22 exp ethinylestradiol/ (16412)
23 ethinylestradiol.tw. (3166)
24 or/7‐23 (411964)
25 6 and 24 (8706)
26 Clinical Trial/ (949969)
27 Randomized Controlled Trial/ (471914)
28 exp randomization/ (75860)
29 Single Blind Procedure/ (29732)
30 Double Blind Procedure/ (140776)
31 Crossover Procedure/ (53437)
32 Placebo/ (300796)
33 Randomi?ed controlled trial$.tw. (168408)
34 Rct.tw. (25850)
35 random allocation.tw. (1695)
36 randomly allocated.tw. (28434)
37 allocated randomly.tw. (2269)
38 (allocated adj2 random).tw. (785)
39 Single blind$.tw. (19880)
40 Double blind$.tw. (175965)
41 ((treble or triple) adj blind$).tw. (717)
42 placebo$.tw. (256628)
43 prospective study/ (405705)
44 or/26‐43 (1812459)
45 case study/ (50227)
46 case report.tw. (340144)
47 abstract report/ or letter/ (1013008)
48 or/45‐47 (1395186)
49 44 not 48 (1766305)
50 25 and 49 (1711)

Appendix 5. PsycINFO search strategy

Searched from 1806 to 19 October 2017

Ovid platform

1 exp Oral Contraceptives/ (871)
2 oral contracept$.tw. (1460)
3 OCP$.tw. (333)
4 ethinyl estradiol.tw. (97)
5 desogestrel.tw. (14)
6 levonorgestrel.tw. (87)
7 norgestrel.tw. (12)
8 (estrogen$ or oestrogen$).tw. (7953)
9 (Progestin$ or Progest?gen$).tw. (789)
10 exp Estradiol/ (2934)
11 Estradiol.tw. (5624)
12 norethisterone.tw. (23)
13 gestodene.tw. (8)
14 ethinylestradiol.tw. (59)
15 or/1‐14 (12986)
16 exp Dyspareunia/ (247)
17 Endometriosis.tw. (222)
18 Dyspareunia.tw. (540)
19 Dyschezia.tw. (7)
20 pelvic pain.tw. (514)
21 or/16‐20 (1190)
22 15 and 21 (78)

Appendix 6. CINAHL search strategy

Searched from 1961 to 19 October 2017

Ebsco platform

#

Query

Results

S36

S23 AND S35

174

S35

S24 OR S25 OR S26 OR S27 OR S28 OR S29 OR S30 OR S31 OR S32 OR S33 OR S34

1,169,103

S34

TX allocat* random*

7,289

S33

(MH "Quantitative Studies")

16,561

S32

(MH "Placebos")

10,403

S31

TX placebo*

47,658

S30

TX random* allocat*

7,289

S29

(MH "Random Assignment")

44,312

S28

TX randomi* control* trial*

132,934

S27

TX ( (singl* n1 blind*) or (singl* n1 mask*) ) or TX ( (doubl* n1 blind*) or (doubl* n1 mask*) ) or TX ( (tripl* n1 blind*) or (tripl* n1 mask*) ) or TX ( (trebl* n1 blind*) or (trebl* n1 mask*) )

912,856

S26

TX clinic* n1 trial*

212,303

S25

PT Clinical trial

80,036

S24

(MH "Clinical Trials+")

222,972

S23

S16 AND S22

598

S22

S17 OR S18 OR S19 OR S20 OR S21

7,342

S21

TX pelvic pain

3,154

S20

TX Dyschezia

26

S19

TX Dyspareunia

1,067

S18

TX Endometrio*

3,828

S17

(MM "Endometriosis")

1,879

S16

S1 OR S2 OR S3 OR S4 OR S5 OR S6 OR S7 OR S8 OR S9 OR S10 OR S11 OR S12 OR S13 OR S14 OR S15

24,946

S15

TX ethinylestradiol

155

S14

TX gestodene

39

S13

TX norethisterone

128

S12

TX Norethindrone

85

S11

TX Progestin* or TX Progest?gen*

1,863

S10

TX estrogen* or oestrogen*

16,303

S9

TX norgestrel

21

S8

TX levonorgestrel

1,485

S7

TX desogestrel or TX dienogest

163

S6

TX ethinyl estradiol

320

S5

TX OCP*

356

S4

TX oral contracept*

6,785

S3

(MM "Levonorgestrel")

679

S2

(MM "Estrogens")

3,098

S1

(MM "Contraceptives, Oral+") OR (MM "Contraceptives, Oral Combined")

7,394

Appendix 7. Trial Registries keyword search

Searched 19 October 2017

Web platform

The keywords 'endometriosis AND oral contraceptive' were used to search:

Study flow diagram.
Figuras y tablas -
Figure 1

Study flow diagram.

Methodological quality graph: review authors' judgements about each methodological quality item presented as percentages across all included studies.
Figuras y tablas -
Figure 2

Methodological quality graph: review authors' judgements about each methodological quality item presented as percentages across all included studies.

Methodological quality summary: review authors' judgements about each methodological quality item for each included study.
Figuras y tablas -
Figure 3

Methodological quality summary: review authors' judgements about each methodological quality item for each included study.

Forest plot of comparison: 1 Combined oral contractive pill (COCP) versus placebo/no treatment, outcome: 1.1 Self‐reported pain (dysmenorrhoea) at end of treatment.
Figuras y tablas -
Figure 4

Forest plot of comparison: 1 Combined oral contractive pill (COCP) versus placebo/no treatment, outcome: 1.1 Self‐reported pain (dysmenorrhoea) at end of treatment.

Forest plot of comparison: 2 Combined oral contractive pill (COCP) versus other medical treatment, outcome: 2.1 Self‐reported pain (dysmenorrhoea) at end of treatment (continuous data).
Figuras y tablas -
Figure 5

Forest plot of comparison: 2 Combined oral contractive pill (COCP) versus other medical treatment, outcome: 2.1 Self‐reported pain (dysmenorrhoea) at end of treatment (continuous data).

Forest plot of comparison: 2 Combined oral contractive pill (COCP) versus other medical treatment, outcome: 2.2 Self‐reported pain (dysmenorrhoea): VAS (dichotomous data).
Figuras y tablas -
Figure 6

Forest plot of comparison: 2 Combined oral contractive pill (COCP) versus other medical treatment, outcome: 2.2 Self‐reported pain (dysmenorrhoea): VAS (dichotomous data).

Forest plot of comparison: 2 Combined oral contractive pill (COCP) versus other medical treatment, outcome: 2.3 Self‐reported pain (dysmenorrhoea): VRS (dichotomous data).
Figuras y tablas -
Figure 7

Forest plot of comparison: 2 Combined oral contractive pill (COCP) versus other medical treatment, outcome: 2.3 Self‐reported pain (dysmenorrhoea): VRS (dichotomous data).

Comparison 1 Combined oral contractive pill (COCP) versus placebo/no treatment, Outcome 1 Self‐reported pain (dysmenorrhoea) at end of treatment.
Figuras y tablas -
Analysis 1.1

Comparison 1 Combined oral contractive pill (COCP) versus placebo/no treatment, Outcome 1 Self‐reported pain (dysmenorrhoea) at end of treatment.

Comparison 1 Combined oral contractive pill (COCP) versus placebo/no treatment, Outcome 2 Cyclical pain (non‐menstrual).
Figuras y tablas -
Analysis 1.2

Comparison 1 Combined oral contractive pill (COCP) versus placebo/no treatment, Outcome 2 Cyclical pain (non‐menstrual).

Comparison 1 Combined oral contractive pill (COCP) versus placebo/no treatment, Outcome 3 Dyspareunia.
Figuras y tablas -
Analysis 1.3

Comparison 1 Combined oral contractive pill (COCP) versus placebo/no treatment, Outcome 3 Dyspareunia.

Comparison 1 Combined oral contractive pill (COCP) versus placebo/no treatment, Outcome 4 Dyschezia (pain on defecation).
Figuras y tablas -
Analysis 1.4

Comparison 1 Combined oral contractive pill (COCP) versus placebo/no treatment, Outcome 4 Dyschezia (pain on defecation).

Comparison 1 Combined oral contractive pill (COCP) versus placebo/no treatment, Outcome 5 Satisfaction (very highly/highly satisfied).
Figuras y tablas -
Analysis 1.5

Comparison 1 Combined oral contractive pill (COCP) versus placebo/no treatment, Outcome 5 Satisfaction (very highly/highly satisfied).

Comparison 1 Combined oral contractive pill (COCP) versus placebo/no treatment, Outcome 6 Withdrawal from treatment.
Figuras y tablas -
Analysis 1.6

Comparison 1 Combined oral contractive pill (COCP) versus placebo/no treatment, Outcome 6 Withdrawal from treatment.

Comparison 1 Combined oral contractive pill (COCP) versus placebo/no treatment, Outcome 7 Adverse effects occurring during treatment.
Figuras y tablas -
Analysis 1.7

Comparison 1 Combined oral contractive pill (COCP) versus placebo/no treatment, Outcome 7 Adverse effects occurring during treatment.

Comparison 2 Combined oral contractive pill (COCP) versus other medical treatment, Outcome 1 Self‐reported pain (dysmenorrhoea) at end of treatment (continuous data).
Figuras y tablas -
Analysis 2.1

Comparison 2 Combined oral contractive pill (COCP) versus other medical treatment, Outcome 1 Self‐reported pain (dysmenorrhoea) at end of treatment (continuous data).

Comparison 2 Combined oral contractive pill (COCP) versus other medical treatment, Outcome 2 Self‐reported pain (dysmenorrhoea): VAS (dichotomous data).
Figuras y tablas -
Analysis 2.2

Comparison 2 Combined oral contractive pill (COCP) versus other medical treatment, Outcome 2 Self‐reported pain (dysmenorrhoea): VAS (dichotomous data).

Comparison 2 Combined oral contractive pill (COCP) versus other medical treatment, Outcome 3 Self‐reported pain (dysmenorrhoea): VRS (dichotomous data).
Figuras y tablas -
Analysis 2.3

Comparison 2 Combined oral contractive pill (COCP) versus other medical treatment, Outcome 3 Self‐reported pain (dysmenorrhoea): VRS (dichotomous data).

Comparison 2 Combined oral contractive pill (COCP) versus other medical treatment, Outcome 4 Cyclical pain (non‐menstrual pain) (continuous data).
Figuras y tablas -
Analysis 2.4

Comparison 2 Combined oral contractive pill (COCP) versus other medical treatment, Outcome 4 Cyclical pain (non‐menstrual pain) (continuous data).

Comparison 2 Combined oral contractive pill (COCP) versus other medical treatment, Outcome 5 Cyclical pain (non‐menstrual pain) (dichotomous data).
Figuras y tablas -
Analysis 2.5

Comparison 2 Combined oral contractive pill (COCP) versus other medical treatment, Outcome 5 Cyclical pain (non‐menstrual pain) (dichotomous data).

Comparison 2 Combined oral contractive pill (COCP) versus other medical treatment, Outcome 6 Dyspareunia (continuous data).
Figuras y tablas -
Analysis 2.6

Comparison 2 Combined oral contractive pill (COCP) versus other medical treatment, Outcome 6 Dyspareunia (continuous data).

Comparison 2 Combined oral contractive pill (COCP) versus other medical treatment, Outcome 7 Dyspareunia (dichotomous data).
Figuras y tablas -
Analysis 2.7

Comparison 2 Combined oral contractive pill (COCP) versus other medical treatment, Outcome 7 Dyspareunia (dichotomous data).

Comparison 2 Combined oral contractive pill (COCP) versus other medical treatment, Outcome 8 Withdrawal from treatment.
Figuras y tablas -
Analysis 2.8

Comparison 2 Combined oral contractive pill (COCP) versus other medical treatment, Outcome 8 Withdrawal from treatment.

Comparison 2 Combined oral contractive pill (COCP) versus other medical treatment, Outcome 9 Adverse effects.
Figuras y tablas -
Analysis 2.9

Comparison 2 Combined oral contractive pill (COCP) versus other medical treatment, Outcome 9 Adverse effects.

Summary of findings for the main comparison. Combined oral contraceptive pill compared to placebo or no treatment for pain associated with endometriosis

Combined oral contraceptive pill (COCP) compared to placebo/no treatment for pain associated with endometriosis

Patient or population: women with endometriosis
Setting: Japan
Intervention: COCP
Comparison: placebo

Outcomes

Anticipated absolute effects* (95% CI)

Relative effect
(95% CI)

No of participants
(studies)

Quality of the evidence
(GRADE)

Comments

Risk with placebo/no treatment

Risk with COCP

Self‐reported pain (dysmenorrhoea) at the end of treatment: dysmenorrhoea VRS

The mean self‐reported pain (dysmenorrhoea) at the end of treatment: Dysmenorrhoea VRS was 3.7

MD 1.3 lower
(1.84 lower to 0.76 lower)

96
(1 RCT)

⊕⊝⊝⊝
Very low1,2

VRS ranged from 0 to 3.

Self‐reported pain (dysmenorrhoea) at the end of treatment: dysmenorrhoea VAS

The mean self‐reported pain (dysmenorrhoea) at the end of treatment: Dysmenorrhoea VAS was 46.2

MD 23.68 lower
(28.75 lower to 18.62 lower)

327
(2 RCTs)

⊕⊝⊝⊝
Very low2,3

No details provided for the VAS.

Self‐reported pain: menstrual pain reduction from baseline to end of treatment

The mean menstrual pain (reduction from baseline to end of treatment) was 3.00

MD 2.10 lower (1.38 lower to 2.82 lower)

169

(1 RCT)

⊕⊝⊝⊝
Very low1,2

Used a VAS from 0 to 10 where 10 was extreme pain.

*The risk in the intervention group (and its 95% confidence interval) is based on the assumed risk in the comparison group and the relative effect of the intervention (and its 95% CI).

CI: confidence interval; COCP: combined oral contraceptive pill; MD: mean difference; RCT: randomised controlled trial; VAS: visual analogue scale; VRS: verbal rating scale.

GRADE Working Group grades of evidence
High quality: we are very confident that the true effect lies close to that of the estimate of the effect.
Moderate quality: we are moderately confident in the effect estimate: the true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different.
Low quality: our confidence in the effect estimate is limited: the true effect may be substantially different from the estimate of the effect.
Very low quality: we have very little confidence in the effect estimate: the true effect is likely to be substantially different from the estimate of effect.

1Imprecision: evidence was based on a single small trial; downgraded one level.

2Risk of bias: trial judged to be at high risk of bias; downgraded two levels.

3Imprecision: evidence based on a single trial including 96 women; wide confidence intervals; downgraded two levels.

Figuras y tablas -
Summary of findings for the main comparison. Combined oral contraceptive pill compared to placebo or no treatment for pain associated with endometriosis
Summary of findings 2. Combined oral contraceptive pill compared to other medical treatment for pain associated with endometriosis

Combined oral contraceptive pill (COCP) compared to other medical treatment for pain associated with endometriosis

Patient or population: women with endometriosis
Setting: Italy
Intervention: COCP
Comparison: other medical treatment (goserelin)

Outcomes

Anticipated absolute effects* (95% CI)

Relative effect
(95% CI)

No of participants
(studies)

Quality of the evidence
(GRADE)

Comments

Risk with other medical treatment

Risk with COCP

Self‐reported pain (dysmenorrhoea) at the end of treatment (continuous data): dysmenorrhoea at 6 months' follow‐up: VAS

The mean self‐reported pain (dysmenorrhoea) at the end of treatment (continuous data): dysmenorrhoea at 6 months' follow‐up was 7.5

MD 0.1 lower
(1.28 lower to 1.08 higher)

50
(1 RCT)

⊕⊝⊝⊝
Very low1,2

VAS ranged from 1 to 10.

Self‐reported pain (dysmenorrhoea) at the end of treatment (continuous data): dysmenorrhoea at 6 months' follow‐up: VRS

The mean self‐reported pain (dysmenorrhoea) at the end of treatment (continuous data): dysmenorrhoea at 6 months' follow‐up was 4.8

MD 0.1 lower
(0.99 lower to 0.79 higher)

50
(1 RCT)

⊕⊝⊝⊝
Very low1,2

VRS ranged from 0 to 3.

Self‐reported pain (dysmenorrhoea) (dichotomous data): reduction of pain to zero at 6 months' follow‐up: VAS

38 per 1000

14 per 1000
(1 to 324)

RR 0.36
(0.02 to 8.43)

50
(1 RCT)

⊕⊝⊝⊝
Very low1,2

VAS ranged from 1 to 10.

Self‐reported pain (dysmenorrhoea) (dichotomous data) ‐ reduction of pain to zero at 6 months' follow‐up: VRS

1000 per 1000

1000 per 1000
(930 to 1000)

RR 1.00
(0.93 to 1.08)

49
(1 RCT)

⊕⊕⊝⊝
Low1,3

VRS ranged from 0 to 3.

*The risk in the intervention group (and its 95% confidence interval) is based on the assumed risk in the comparison group and the relative effect of the intervention (and its 95% CI).

CI: confidence interval; COCP: combined oral contraceptive pill; MD: mean difference; RCT: randomised controlled trial; RR: risk ratio; VAS: visual analogue scale; VRS: verbal rating scale.

GRADE Working Group grades of evidence
High quality: we are very confident that the true effect lies close to that of the estimate of the effect.
Moderate quality: we are moderately confident in the effect estimate: the true effect is likely to be close to the estimate of the effect, but there is a possibility that it is substantially different.
Low quality: our confidence in the effect estimate is limited: the true effect may be substantially different from the estimate of the effect.
Very low quality: we have very little confidence in the effect estimate: the true effect is likely to be substantially different from the estimate of effect.

1Risk of bias: no blinding and randomisation and allocation concealment unclear; downgraded one level.

2Imprecision: evidence from a single small trial including 50 women; wide confidence intervals crossing the line of no effect; downgraded two levels.

3Imprecision: evidence from a single small trial reporting data on 49 women; downgraded one level.

Figuras y tablas -
Summary of findings 2. Combined oral contraceptive pill compared to other medical treatment for pain associated with endometriosis
Comparison 1. Combined oral contractive pill (COCP) versus placebo/no treatment

Outcome or subgroup title

No. of studies

No. of participants

Statistical method

Effect size

1 Self‐reported pain (dysmenorrhoea) at end of treatment Show forest plot

2

Mean Difference (IV, Fixed, 95% CI)

Subtotals only

1.1 Dysmenorrhoea at end of treatment: verbal rating scale (VRS)

1

96

Mean Difference (IV, Fixed, 95% CI)

‐1.30 [‐1.84, ‐0.76]

1.2 Dysmenorrhoea at end of treatment: visual analogue scale (VAS)

2

327

Mean Difference (IV, Fixed, 95% CI)

‐23.68 [‐28.75, ‐18.62]

1.3 Menstrual pain reduction from baseline to end of treatment: VAS)

1

169

Mean Difference (IV, Fixed, 95% CI)

2.1 [1.38, 2.82]

2 Cyclical pain (non‐menstrual) Show forest plot

2

Mean Difference (IV, Fixed, 95% CI)

Subtotals only

2.1 Non‐menstrual pain at end of treatment: VRS

1

96

Mean Difference (IV, Fixed, 95% CI)

0.10 [‐0.48, 0.68]

2.2 Non‐menstrual pain at end of treatment: VAS

1

96

Mean Difference (IV, Fixed, 95% CI)

‐1.90 [‐11.72, 7.92]

2.3 Non‐menstrual pain reduction from baseline to end of treatment: VAS

1

212

Mean Difference (IV, Fixed, 95% CI)

1.00 [0.30, 1.70]

3 Dyspareunia Show forest plot

1

89

Mean Difference (IV, Fixed, 95% CI)

1.4 [0.46, 2.34]

4 Dyschezia (pain on defecation) Show forest plot

1

231

Mean Difference (IV, Fixed, 95% CI)

1.2 [0.56, 1.84]

5 Satisfaction (very highly/highly satisfied) Show forest plot

1

258

Risk Ratio (M‐H, Fixed, 95% CI)

4.24 [2.44, 7.37]

6 Withdrawal from treatment Show forest plot

2

354

Risk Ratio (M‐H, Fixed, 95% CI)

1.34 [0.83, 2.18]

7 Adverse effects occurring during treatment Show forest plot

2

Risk Ratio (M‐H, Fixed, 95% CI)

Subtotals only

7.1 Pregnancy

1

96

Risk Ratio (M‐H, Fixed, 95% CI)

2.88 [0.12, 68.98]

7.2 Spotting/irregular bleeding/menorrhagia

2

354

Risk Ratio (M‐H, Fixed, 95% CI)

2.44 [1.44, 4.15]

7.3 Nausea

2

354

Risk Ratio (M‐H, Fixed, 95% CI)

4.14 [1.79, 9.54]

7.4 Any treatment‐associated adverse effect

1

258

Risk Ratio (M‐H, Fixed, 95% CI)

1.17 [1.00, 1.36]

Figuras y tablas -
Comparison 1. Combined oral contractive pill (COCP) versus placebo/no treatment
Comparison 2. Combined oral contractive pill (COCP) versus other medical treatment

Outcome or subgroup title

No. of studies

No. of participants

Statistical method

Effect size

1 Self‐reported pain (dysmenorrhoea) at end of treatment (continuous data) Show forest plot

1

Mean Difference (IV, Fixed, 95% CI)

Subtotals only

1.1 Dysmenorrhoea at 6 months' follow‐up: visual analogue scale (VAS)

1

50

Mean Difference (IV, Fixed, 95% CI)

‐0.10 [‐1.28, 1.08]

1.2 Dysmenorrhoea at 6 months' follow‐up: verbal rating scale (VRS)

1

50

Mean Difference (IV, Fixed, 95% CI)

‐0.10 [‐0.99, 0.79]

2 Self‐reported pain (dysmenorrhoea): VAS (dichotomous data) Show forest plot

1

Risk Ratio (M‐H, Fixed, 95% CI)

Subtotals only

2.1 Reduction of pain to mild or zero at 6 months' follow‐up

1

50

Risk Ratio (M‐H, Fixed, 95% CI)

0.90 [0.32, 2.58]

2.2 Reduction of pain to zero at 6 months' follow‐up

1

50

Risk Ratio (M‐H, Fixed, 95% CI)

0.36 [0.02, 8.43]

3 Self‐reported pain (dysmenorrhoea): VRS (dichotomous data) Show forest plot

1

Risk Ratio (M‐H, Fixed, 95% CI)

Subtotals only

3.1 Reduction of pain to mild or zero at 6 months' follow‐up

1

44

Risk Ratio (M‐H, Fixed, 95% CI)

0.94 [0.70, 1.28]

3.2 Reduction of pain to zero at 6 months' follow‐up

1

49

Risk Ratio (M‐H, Fixed, 95% CI)

1.0 [0.93, 1.08]

4 Cyclical pain (non‐menstrual pain) (continuous data) Show forest plot

1

Mean Difference (IV, Fixed, 95% CI)

Subtotals only

4.1 Non‐menstrual pain at end of treatment: VAS

1

50

Mean Difference (IV, Fixed, 95% CI)

‐0.20 [‐1.51, 1.11]

4.2 Non‐menstrual pain at end of treatment: VRS

1

50

Mean Difference (IV, Fixed, 95% CI)

0.40 [‐0.51, 1.31]

4.3 Non‐menstrual pain at 6 months' follow‐up: VAS

1

50

Mean Difference (IV, Fixed, 95% CI)

‐0.30 [‐1.85, 1.25]

4.4 Non‐menstrual pain at 6 months' follow‐up: VRS

1

50

Mean Difference (IV, Fixed, 95% CI)

0.0 [‐1.08, 1.08]

5 Cyclical pain (non‐menstrual pain) (dichotomous data) Show forest plot

1

Risk Ratio (M‐H, Fixed, 95% CI)

Subtotals only

5.1 Reduction of pain to mild or zero at end of treatment: VAS

1

50

Risk Ratio (M‐H, Fixed, 95% CI)

0.99 [0.81, 1.21]

5.2 Reduction of pain to zero at end of treatment: VAS

1

50

Risk Ratio (M‐H, Fixed, 95% CI)

0.98 [0.51, 1.89]

5.3 Reduction of pain to mild or zero at end of treatment: VRS

1

50

Risk Ratio (M‐H, Fixed, 95% CI)

0.99 [0.84, 1.17]

5.4 Reduction to zero at end of treatment: VRS

1

50

Risk Ratio (M‐H, Fixed, 95% CI)

0.98 [0.51, 1.89]

5.5 Reduction of pain to mild or zero at 6 months' follow‐up: VAS

1

50

Risk Ratio (M‐H, Fixed, 95% CI)

1.14 [0.85, 1.53]

5.6 Reduction of pain to zero at 6 months' follow‐up: VAS

1

50

Risk Ratio (M‐H, Fixed, 95% CI)

0.87 [0.26, 2.85]

5.7 Reduction of pain to mild or zero at 6 months' follow‐up: VRS

1

50

Risk Ratio (M‐H, Fixed, 95% CI)

0.91 [0.63, 1.32]

5.8 Reduction of pain to zero at 6 months' follow‐up: VRS

1

50

Risk Ratio (M‐H, Fixed, 95% CI)

0.87 [0.26, 2.85]

6 Dyspareunia (continuous data) Show forest plot

1

Mean Difference (IV, Fixed, 95% CI)

Subtotals only

6.1 Dyspareunia at end of treatment: VAS

1

43

Mean Difference (IV, Fixed, 95% CI)

1.80 [0.18, 3.42]

6.2 Dyspareunia at end of treatment: VRS

1

43

Mean Difference (IV, Fixed, 95% CI)

0.10 [‐0.41, 0.61]

6.3 Dyspareunia at 6 months' follow‐up: VAS

1

43

Mean Difference (IV, Fixed, 95% CI)

0.40 [‐1.30, 2.10]

6.4 Dyspareunia at 6 months' follow‐up: VRS

1

43

Mean Difference (IV, Fixed, 95% CI)

0.10 [‐0.47, 0.67]

7 Dyspareunia (dichotomous data) Show forest plot

1

Risk Ratio (M‐H, Fixed, 95% CI)

Subtotals only

7.1 Reduction of pain to mild or zero at end of treatment: VAS

1

43

Risk Ratio (M‐H, Fixed, 95% CI)

0.73 [0.53, 1.02]

7.2 Reduction of pain to zero at end of treatment: VAS

1

43

Risk Ratio (M‐H, Fixed, 95% CI)

0.52 [0.19, 1.48]

7.3 Reduction of pain to mild or zero at end of treatment: VRS

1

25

Risk Ratio (M‐H, Fixed, 95% CI)

0.96 [0.56, 1.65]

7.4 Reduction of pain to zero at end of treatment: VRS

1

38

Risk Ratio (M‐H, Fixed, 95% CI)

1.35 [0.99, 1.84]

7.5 Reduction of pain to mild or zero at 6 months' follow‐up: VAS

1

43

Risk Ratio (M‐H, Fixed, 95% CI)

1.05 [0.62, 1.78]

7.6 Reduction of pain to zero at 6 months' follow‐up: VAS

1

43

Risk Ratio (M‐H, Fixed, 95% CI)

0.70 [0.13, 3.77]

7.7 Reduction of pain to mild or zero at 6 months' follow‐up: VRS

1

43

Risk Ratio (M‐H, Fixed, 95% CI)

0.96 [0.55, 1.68]

7.8 Reduction of pain to zero at 6 months' follow‐up: VRS

1

43

Risk Ratio (M‐H, Fixed, 95% CI)

0.70 [0.13, 3.77]

8 Withdrawal from treatment Show forest plot

1

57

Risk Ratio (M‐H, Fixed, 95% CI)

1.38 [0.34, 5.62]

9 Adverse effects Show forest plot

1

Risk Ratio (M‐H, Fixed, 95% CI)

Subtotals only

9.1 Hot flushes

1

57

Risk Ratio (M‐H, Fixed, 95% CI)

0.04 [0.01, 0.30]

9.2 Insomnia

1

57

Risk Ratio (M‐H, Fixed, 95% CI)

0.07 [0.00, 1.15]

9.3 Spotting/irregular bleeding

1

57

Risk Ratio (M‐H, Fixed, 95% CI)

1.21 [0.46, 3.15]

9.4 Decreased libido

1

57

Risk Ratio (M‐H, Fixed, 95% CI)

0.69 [0.22, 2.19]

9.5 Vaginal dryness

1

57

Risk Ratio (M‐H, Fixed, 95% CI)

0.09 [0.01, 1.63]

9.6 Mood change

1

57

Risk Ratio (M‐H, Fixed, 95% CI)

1.04 [0.34, 3.19]

9.7 Headache

1

57

Risk Ratio (M‐H, Fixed, 95% CI)

1.55 [0.49, 4.92]

9.8 Paraesthesia

1

57

Risk Ratio (M‐H, Fixed, 95% CI)

0.35 [0.04, 3.12]

9.9 Breast tenderness

1

57

Risk Ratio (M‐H, Fixed, 95% CI)

1.73 [0.45, 6.55]

9.10 Weight gain

1

57

Risk Ratio (M‐H, Fixed, 95% CI)

2.07 [0.41, 10.43]

9.11 Peripheral oedema

1

57

Risk Ratio (M‐H, Fixed, 95% CI)

1.04 [0.07, 15.77]

9.12 Joint pain

1

57

Risk Ratio (M‐H, Fixed, 95% CI)

0.34 [0.01, 8.12]

Figuras y tablas -
Comparison 2. Combined oral contractive pill (COCP) versus other medical treatment