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'Risk of bias' summary
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Figure 1

'Risk of bias' summary

Forest plot of comparison: 1 Oral corticosteroids versus placebo or NSAID, outcome: 1.1 Proportion of patients with resolution or improved symptoms at days 3 to 7, stratified to very short‐term (days 3 to 4) and short‐term (days 6‐7).
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Figure 2

Forest plot of comparison: 1 Oral corticosteroids versus placebo or NSAID, outcome: 1.1 Proportion of patients with resolution or improved symptoms at days 3 to 7, stratified to very short‐term (days 3 to 4) and short‐term (days 6‐7).

Forest plot of comparison: 1 Oral corticosteroids versus placebo or NSAID, outcome: 1.2 Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12.
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Figure 3

Forest plot of comparison: 1 Oral corticosteroids versus placebo or NSAID, outcome: 1.2 Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12.

Forest plot of comparison: 2 Sensitivity analysis ‐ Oral corticosteroids versus placebo, outcome: 2.1 Proportion of patients with resolution or improved symptoms at days 3 to 6.
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Figure 4

Forest plot of comparison: 2 Sensitivity analysis ‐ Oral corticosteroids versus placebo, outcome: 2.1 Proportion of patients with resolution or improved symptoms at days 3 to 6.

Forest plot of comparison: 2 Sensitivity analysis ‐ Oral corticosteroids versus placebo, outcome: 2.2 Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12.
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Figure 5

Forest plot of comparison: 2 Sensitivity analysis ‐ Oral corticosteroids versus placebo, outcome: 2.2 Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12.

Funnel plot of comparison: 1 Oral corticosteroids versus placebo or NSAID, outcome: 1.1 Proportion of patients with resolution or improved symptoms at days 3 to 7.
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Figure 6

Funnel plot of comparison: 1 Oral corticosteroids versus placebo or NSAID, outcome: 1.1 Proportion of patients with resolution or improved symptoms at days 3 to 7.

Comparison 1 Oral corticosteroids versus placebo or NSAID, Outcome 1 Proportion of patients with resolution or improved symptoms at days 3 to 7.
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Analysis 1.1

Comparison 1 Oral corticosteroids versus placebo or NSAID, Outcome 1 Proportion of patients with resolution or improved symptoms at days 3 to 7.

Comparison 1 Oral corticosteroids versus placebo or NSAID, Outcome 2 Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12.
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Analysis 1.2

Comparison 1 Oral corticosteroids versus placebo or NSAID, Outcome 2 Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12.

Comparison 2 Sensitivity analysis ‐ oral corticosteroids versus placebo, Outcome 1 Proportion of patients with resolution or improved symptoms at days 3 to 6.
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Analysis 2.1

Comparison 2 Sensitivity analysis ‐ oral corticosteroids versus placebo, Outcome 1 Proportion of patients with resolution or improved symptoms at days 3 to 6.

Comparison 2 Sensitivity analysis ‐ oral corticosteroids versus placebo, Outcome 2 Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12.
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Analysis 2.2

Comparison 2 Sensitivity analysis ‐ oral corticosteroids versus placebo, Outcome 2 Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12.

Comparison 3 Best and worst‐case scenario ‐ oral corticosteroids versus NSAID or placebo, Outcome 1 Proportion of patients with resolution or improved symptoms at days 3 to 7 ‐ best‐case scenario.
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Analysis 3.1

Comparison 3 Best and worst‐case scenario ‐ oral corticosteroids versus NSAID or placebo, Outcome 1 Proportion of patients with resolution or improved symptoms at days 3 to 7 ‐ best‐case scenario.

Comparison 3 Best and worst‐case scenario ‐ oral corticosteroids versus NSAID or placebo, Outcome 2 Proportion of patients with resolution or improved symptoms at days 3 to 7 ‐ worst‐case scenario.
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Analysis 3.2

Comparison 3 Best and worst‐case scenario ‐ oral corticosteroids versus NSAID or placebo, Outcome 2 Proportion of patients with resolution or improved symptoms at days 3 to 7 ‐ worst‐case scenario.

Comparison 3 Best and worst‐case scenario ‐ oral corticosteroids versus NSAID or placebo, Outcome 3 Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12 ‐ best‐case scenario.
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Analysis 3.3

Comparison 3 Best and worst‐case scenario ‐ oral corticosteroids versus NSAID or placebo, Outcome 3 Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12 ‐ best‐case scenario.

Comparison 3 Best and worst‐case scenario ‐ oral corticosteroids versus NSAID or placebo, Outcome 4 Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12 ‐ worst‐case scenario.
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Analysis 3.4

Comparison 3 Best and worst‐case scenario ‐ oral corticosteroids versus NSAID or placebo, Outcome 4 Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12 ‐ worst‐case scenario.

Comparison 4 Best and worst‐case scenario ‐ oral corticosteroids versus placebo, Outcome 1 Proportion of patients with resolution or improved symptoms at days 3 to 6 ‐ best‐case scenario.
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Analysis 4.1

Comparison 4 Best and worst‐case scenario ‐ oral corticosteroids versus placebo, Outcome 1 Proportion of patients with resolution or improved symptoms at days 3 to 6 ‐ best‐case scenario.

Comparison 4 Best and worst‐case scenario ‐ oral corticosteroids versus placebo, Outcome 2 Proportion of patients with resolution or improved symptoms at days 3 to 6 ‐ worst‐case scenario.
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Analysis 4.2

Comparison 4 Best and worst‐case scenario ‐ oral corticosteroids versus placebo, Outcome 2 Proportion of patients with resolution or improved symptoms at days 3 to 6 ‐ worst‐case scenario.

Comparison 4 Best and worst‐case scenario ‐ oral corticosteroids versus placebo, Outcome 3 Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12 ‐ best‐case scenario.
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Analysis 4.3

Comparison 4 Best and worst‐case scenario ‐ oral corticosteroids versus placebo, Outcome 3 Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12 ‐ best‐case scenario.

Comparison 4 Best and worst‐case scenario ‐ oral corticosteroids versus placebo, Outcome 4 Proportion of patients with resolution or improved symptoms at days 4 to 10 to 12 ‐ worst‐case scenario.
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Analysis 4.4

Comparison 4 Best and worst‐case scenario ‐ oral corticosteroids versus placebo, Outcome 4 Proportion of patients with resolution or improved symptoms at days 4 to 10 to 12 ‐ worst‐case scenario.

Corticosteroids compared with placebo or NSAIDs for acute sinusitis

Outcomes

Relative effect
(95% CI)

No of participants
(studies)

Quality of the evidence
(GRADE)

Proportion of patients with resolution or improved symptoms at days 3 to 7

RR 1.40 (1.08 to 1.81)

869 (4)

Moderate

Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12

RR 1.32 (1.04 to 1.68)

945 (4)

Moderate

GRADE Working Group grades of evidence
High quality: Further research is very unlikely to change our confidence in the estimate of effect.
Moderate quality: Further research is likely to have an important impact on our confidence in the estimate of effect and may change the estimate.
Low quality: Further research is very likely to have an important impact on our confidence in the estimate of effect and is likely to change the estimate.
Very low quality: We are very uncertain about the estimate.

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Table 1. Adverse events

Study

Intervention

Comparison

Side effects

Comments

Cannoni 1990

Prednisolone 40 mg once daily for participants with a weight < 60 kg and prednisolone 60 mg once daily for participants with a weight > 60 kg for 7 days

Niflumic acid (NSAID) 250 mg 3 daily for 7 days

Nausea, vomiting, gastric complaints

Adverse events NSAID group versus corticosteroid group: 51 versus 23 (P < 0.05)

Discontinuation of study participation due to adverse events NSAID group versus corticosteroid group: 7 versus 0 (P < 0.05)

Gehanno 2000

Methylprednisolone 8 mg 3 daily for 5 days

Placebo

Nausea, vomiting, diarrhoea, gastric pain, skin reactions and candidal superinfection

Intercurrent events corticosteroid group versus placebo group: 24 (11%) versus 22 (10%)

Discontinuation of treatment due to intercurrent events corticosteroid group versus placebo group: 5 versus 3

Klossek 2004

Prednisone 0.8 to 1.2 mg/kg (weight 40 to 60 kg: 40 mg, weight 60 to 80 kg: 60 mg, weight > 80 kg: 80 mg) for 3 days

Placebo

Vomiting, diarrhoea abdominal pain, allergic reaction

46 adverse events were noted; no statistical difference between the groups

7/46 were rated as severe by the patient: 3 in corticosteroid group (1 diarrhoea, 1 acute gastroenteritis, 1 abdominal pain) versus 4 in placebo group (1 vomiting, 1 abdominal pain, 1 neuralgia, 1 ear pain)

5 adverse events are possibly related to the treatment: 4 in corticosteroid group (diarrhoea, acute gastroenteritis, abdominal pain, allergic reaction) and 1 in placebo group (moderate colitis)

Ratau 2004

Betamethasone 1 mg orally once daily for 5 days

Placebo

No adverse events reported

No adverse events or eruptions of new diseases associated with the use of betamethasone were reported

Two adverse reactions were reported in the placebo group: cough and maculopapular rash

NSAID: non‐steroidal anti‐inflammatory drug

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Table 1. Adverse events
Comparison 1. Oral corticosteroids versus placebo or NSAID

Outcome or subgroup title

No. of studies

No. of participants

Statistical method

Effect size

1 Proportion of patients with resolution or improved symptoms at days 3 to 7 Show forest plot

4

869

Risk Ratio (M‐H, Random, 95% CI)

1.40 [1.08, 1.81]

1.1 Very short‐term (days 3 to 4)

2

624

Risk Ratio (M‐H, Random, 95% CI)

1.18 [1.05, 1.32]

1.2 Short‐term (days 6 to 7)

2

245

Risk Ratio (M‐H, Random, 95% CI)

1.83 [1.44, 2.31]

2 Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12 Show forest plot

4

945

Risk Ratio (M‐H, Random, 95% CI)

1.32 [1.04, 1.68]

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Comparison 1. Oral corticosteroids versus placebo or NSAID
Comparison 2. Sensitivity analysis ‐ oral corticosteroids versus placebo

Outcome or subgroup title

No. of studies

No. of participants

Statistical method

Effect size

1 Proportion of patients with resolution or improved symptoms at days 3 to 6 Show forest plot

3

666

Risk Ratio (M‐H, Fixed, 95% CI)

1.20 [1.07, 1.35]

2 Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12 Show forest plot

3

742

Risk Ratio (M‐H, Fixed, 95% CI)

1.14 [1.04, 1.24]

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Comparison 2. Sensitivity analysis ‐ oral corticosteroids versus placebo
Comparison 3. Best and worst‐case scenario ‐ oral corticosteroids versus NSAID or placebo

Outcome or subgroup title

No. of studies

No. of participants

Statistical method

Effect size

1 Proportion of patients with resolution or improved symptoms at days 3 to 7 ‐ best‐case scenario Show forest plot

4

1008

Risk Ratio (M‐H, Random, 95% CI)

1.74 [1.15, 2.64]

2 Proportion of patients with resolution or improved symptoms at days 3 to 7 ‐ worst‐case scenario Show forest plot

4

1008

Risk Ratio (M‐H, Random, 95% CI)

1.09 [0.72, 1.66]

3 Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12 ‐ best‐case scenario Show forest plot

4

1008

Risk Ratio (M‐H, Random, 95% CI)

1.42 [1.12, 1.82]

4 Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12 ‐ worst‐case scenario Show forest plot

4

1008

Risk Ratio (M‐H, Random, 95% CI)

1.19 [0.93, 1.52]

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Comparison 3. Best and worst‐case scenario ‐ oral corticosteroids versus NSAID or placebo
Comparison 4. Best and worst‐case scenario ‐ oral corticosteroids versus placebo

Outcome or subgroup title

No. of studies

No. of participants

Statistical method

Effect size

1 Proportion of patients with resolution or improved symptoms at days 3 to 6 ‐ best‐case scenario Show forest plot

3

789

Risk Ratio (M‐H, Random, 95% CI)

1.62 [0.97, 2.69]

2 Proportion of patients with resolution or improved symptoms at days 3 to 6 ‐ worst‐case scenario Show forest plot

3

789

Risk Ratio (M‐H, Random, 95% CI)

0.96 [0.57, 1.59]

3 Proportion of patients with resolution or improved symptoms at days 4 to 10 or 12 ‐ best‐case scenario Show forest plot

3

789

Risk Ratio (M‐H, Fixed, 95% CI)

1.21 [1.11, 1.32]

4 Proportion of patients with resolution or improved symptoms at days 4 to 10 to 12 ‐ worst‐case scenario Show forest plot

3

789

Risk Ratio (M‐H, Random, 95% CI)

1.04 [0.87, 1.26]

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Comparison 4. Best and worst‐case scenario ‐ oral corticosteroids versus placebo