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Study flow diagram
Figuras y tablas -
Figure 1

Study flow diagram

Risk of bias summary: review authors' judgements about each risk of bias item for each included study.
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Figure 2

Risk of bias summary: review authors' judgements about each risk of bias item for each included study.

Risk of bias graph: review authors' judgements about each risk of bias item presented as percentages across all included studies.
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Figure 3

Risk of bias graph: review authors' judgements about each risk of bias item presented as percentages across all included studies.

Comparison 1 Probiotics versus placebo in adults and children, Outcome 1 Symptomatic bacterial UTI.
Figuras y tablas -
Analysis 1.1

Comparison 1 Probiotics versus placebo in adults and children, Outcome 1 Symptomatic bacterial UTI.

Comparison 1 Probiotics versus placebo in adults and children, Outcome 2 Worst case scenario ‐ symptomatic bacterial UTI.
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Analysis 1.2

Comparison 1 Probiotics versus placebo in adults and children, Outcome 2 Worst case scenario ‐ symptomatic bacterial UTI.

Comparison 2 Probiotics versus antibiotics in women, Outcome 1 Symptomatic bacterial UTI.
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Analysis 2.1

Comparison 2 Probiotics versus antibiotics in women, Outcome 1 Symptomatic bacterial UTI.

Comparison 2 Probiotics versus antibiotics in women, Outcome 2 Worst case scenario probiotics ‐ symptomatic bacterial UTI.
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Analysis 2.2

Comparison 2 Probiotics versus antibiotics in women, Outcome 2 Worst case scenario probiotics ‐ symptomatic bacterial UTI.

Comparison 2 Probiotics versus antibiotics in women, Outcome 3 Worst case scenario antibiotics ‐ symptomatic bacterial UTI.
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Analysis 2.3

Comparison 2 Probiotics versus antibiotics in women, Outcome 3 Worst case scenario antibiotics ‐ symptomatic bacterial UTI.

Comparison 3 Probiotics versus control in children with vesicoureteric reflux, Outcome 1 Symptomatic bacterial UTI.
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Analysis 3.1

Comparison 3 Probiotics versus control in children with vesicoureteric reflux, Outcome 1 Symptomatic bacterial UTI.

Comparison 4 Worst case scenario imputation ‐ symptomatic bacterial UTI, Outcome 1 Placebo comparison.
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Analysis 4.1

Comparison 4 Worst case scenario imputation ‐ symptomatic bacterial UTI, Outcome 1 Placebo comparison.

Comparison 4 Worst case scenario imputation ‐ symptomatic bacterial UTI, Outcome 2 Antibiotic comparison ‐ worst case probiotics.
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Analysis 4.2

Comparison 4 Worst case scenario imputation ‐ symptomatic bacterial UTI, Outcome 2 Antibiotic comparison ‐ worst case probiotics.

Comparison 4 Worst case scenario imputation ‐ symptomatic bacterial UTI, Outcome 3 Antibiotic comparison ‐ worst case antibiotics.
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Analysis 4.3

Comparison 4 Worst case scenario imputation ‐ symptomatic bacterial UTI, Outcome 3 Antibiotic comparison ‐ worst case antibiotics.

Probiotics compared with placebo or antibiotics for urinary tract infections (UTI)

Patient or population: adults and children at risk of UTI

Settings: outpatient

Intervention: probiotics

Comparison: placebo or antibiotics

Outcomes

Illustrative comparative risks* (95% CI)

Relative effect
(95% CI)

No of participants
(studies)

Quality of the evidence
(GRADE)

Comments

Assumed risk

Corresponding risk

Control

Probiotics

Symptomatic bacterial UTI in adults and children in patients with and without recurrent UTI

Probiotics versus placebo

(follow‐up)

395 per 1000

296 per 1000
(197 to 446)

RR 0.75 (0.50, 1.13)

352 (6)

⊕⊕⊝⊝
low

Risk of bias was assessed at unclear or high in most domains and suggest that results are imprecise or overestimate probiotic effects versus placebo

Symptomatic bacterial UTI in adults and children with recurrent UTI

Probiotics versus placebo

(follow‐up)

421 per 1000

315 per 1000
(227 to 425)

RR 0.74 (0.54, 1.01)

275 (4)

⊕⊕⊝⊝
low

Risk of bias was assessed at unclear or high in most domains and suggest that results are imprecise or overestimate probiotic effects versus placebo

Symptomatic bacterial UTI in women with recent UTI

Probiotics versus antibiotics

(follow‐up)

666 per 1000

745 per 1000
(632 to 885)

RR 1.12 (0.95, 1.33)

223 (1)

⊕⊕⊝⊝
low

Risk of bias was assessed at unclear or high in most domains and suggest that results are imprecise or overestimate probiotic effects versus antibiotics.

Imprecision also due to small sample from only one RCT

Symptomatic bacterial UTI in children with VUR

Probiotics versus placebo

(follow‐up)

270 per 1000

145 per 1000
(64 to 332)

RR 0.54 (0.24, 1.23)

96 (1)

⊕⊕⊝⊝
low

Risk of bias was assessed at unclear or high in most domains of and suggest that results are imprecise or overestimate probiotic effects versus placebo.

Imprecision also due to small sample from only one RCT

*The basis for the assumed risk (e.g. the median control group risk across studies) is provided in footnotes. The corresponding risk (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; RR: Risk Ratio

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.

UTi ‐ urinary tract infection

Figuras y tablas -
Comparison 1. Probiotics versus placebo in adults and children

Outcome or subgroup title

No. of studies

No. of participants

Statistical method

Effect size

1 Symptomatic bacterial UTI Show forest plot

6

352

Risk Ratio (M‐H, Random, 95% CI)

0.82 [0.60, 1.12]

1.1 Versus placebo

2

77

Risk Ratio (M‐H, Random, 95% CI)

1.12 [0.65, 1.93]

1.2 Versus placebo with recurrent UTI

4

275

Risk Ratio (M‐H, Random, 95% CI)

0.74 [0.52, 1.05]

2 Worst case scenario ‐ symptomatic bacterial UTI Show forest plot

6

352

Risk Ratio (M‐H, Random, 95% CI)

0.94 [0.63, 1.39]

2.1 Versus placebo

2

77

Risk Ratio (M‐H, Random, 95% CI)

3.71 [0.12, 112.47]

2.2 Versus placebo with recurrent UTI

4

275

Risk Ratio (M‐H, Random, 95% CI)

0.85 [0.60, 1.19]

Figuras y tablas -
Comparison 1. Probiotics versus placebo in adults and children
Comparison 2. Probiotics versus antibiotics in women

Outcome or subgroup title

No. of studies

No. of participants

Statistical method

Effect size

1 Symptomatic bacterial UTI Show forest plot

1

Risk Ratio (M‐H, Random, 95% CI)

Totals not selected

1.1 Versus antibiotics with recent UTI

1

Risk Ratio (M‐H, Random, 95% CI)

0.0 [0.0, 0.0]

2 Worst case scenario probiotics ‐ symptomatic bacterial UTI Show forest plot

1

Risk Ratio (M‐H, Random, 95% CI)

Totals not selected

2.1 Versus antibiotics with recent UTI

1

Risk Ratio (M‐H, Random, 95% CI)

0.0 [0.0, 0.0]

3 Worst case scenario antibiotics ‐ symptomatic bacterial UTI Show forest plot

1

Risk Ratio (M‐H, Random, 95% CI)

Totals not selected

3.1 Versus antibiotics with recent UTI

1

Risk Ratio (M‐H, Random, 95% CI)

0.0 [0.0, 0.0]

Figuras y tablas -
Comparison 2. Probiotics versus antibiotics in women
Comparison 3. Probiotics versus control in children with vesicoureteric reflux

Outcome or subgroup title

No. of studies

No. of participants

Statistical method

Effect size

1 Symptomatic bacterial UTI Show forest plot

1

Risk Ratio (M‐H, Random, 95% CI)

Totals not selected

Figuras y tablas -
Comparison 3. Probiotics versus control in children with vesicoureteric reflux
Comparison 4. Worst case scenario imputation ‐ symptomatic bacterial UTI

Outcome or subgroup title

No. of studies

No. of participants

Statistical method

Effect size

1 Placebo comparison Show forest plot

6

352

Risk Ratio (M‐H, Random, 95% CI)

0.94 [0.63, 1.39]

1.1 Versus placebo

2

77

Risk Ratio (M‐H, Random, 95% CI)

3.71 [0.12, 112.47]

1.2 Versus placebo with recurrent UTI

4

275

Risk Ratio (M‐H, Random, 95% CI)

0.85 [0.60, 1.19]

2 Antibiotic comparison ‐ worst case probiotics Show forest plot

1

Risk Ratio (M‐H, Random, 95% CI)

Totals not selected

2.1 Versus antibiotics with recent UTI

1

Risk Ratio (M‐H, Random, 95% CI)

0.0 [0.0, 0.0]

3 Antibiotic comparison ‐ worst case antibiotics Show forest plot

1

Risk Ratio (M‐H, Random, 95% CI)

Totals not selected

3.1 Versus antibiotics with recent UTI

1

Risk Ratio (M‐H, Random, 95% CI)

0.0 [0.0, 0.0]

Figuras y tablas -
Comparison 4. Worst case scenario imputation ‐ symptomatic bacterial UTI