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Comparison 1 Oral betamimetic versus placebo, Outcome 1 Preterm labour.
Figuras y tablas -
Analysis 1.1

Comparison 1 Oral betamimetic versus placebo, Outcome 1 Preterm labour.

Comparison 1 Oral betamimetic versus placebo, Outcome 2 Preterm birth (less than 37 weeks' gestation).
Figuras y tablas -
Analysis 1.2

Comparison 1 Oral betamimetic versus placebo, Outcome 2 Preterm birth (less than 37 weeks' gestation).

Comparison 1 Oral betamimetic versus placebo, Outcome 3 Very preterm birth (less than 34 weeks' gestation).
Figuras y tablas -
Analysis 1.3

Comparison 1 Oral betamimetic versus placebo, Outcome 3 Very preterm birth (less than 34 weeks' gestation).

Comparison 1 Oral betamimetic versus placebo, Outcome 4 Neonatal mortality.
Figuras y tablas -
Analysis 1.4

Comparison 1 Oral betamimetic versus placebo, Outcome 4 Neonatal mortality.

Comparison 1 Oral betamimetic versus placebo, Outcome 5 Low birthweight (less than 2500 g).
Figuras y tablas -
Analysis 1.5

Comparison 1 Oral betamimetic versus placebo, Outcome 5 Low birthweight (less than 2500 g).

Comparison 1 Oral betamimetic versus placebo, Outcome 6 Small‐for‐gestational age (birthweight less than 10th centile).
Figuras y tablas -
Analysis 1.6

Comparison 1 Oral betamimetic versus placebo, Outcome 6 Small‐for‐gestational age (birthweight less than 10th centile).

Comparison 1 Oral betamimetic versus placebo, Outcome 7 Birthweight.
Figuras y tablas -
Analysis 1.7

Comparison 1 Oral betamimetic versus placebo, Outcome 7 Birthweight.

Comparison 1 Oral betamimetic versus placebo, Outcome 8 Respiratory distress syndrome.
Figuras y tablas -
Analysis 1.8

Comparison 1 Oral betamimetic versus placebo, Outcome 8 Respiratory distress syndrome.

Comparison 1 Oral betamimetic versus placebo, Outcome 9 Maternal death.
Figuras y tablas -
Analysis 1.9

Comparison 1 Oral betamimetic versus placebo, Outcome 9 Maternal death.

Comparison 1. Oral betamimetic versus placebo

Outcome or subgroup title

No. of studies

No. of participants

Statistical method

Effect size

1 Preterm labour Show forest plot

1

50

Risk Ratio (M‐H, Fixed, 95% CI)

0.4 [0.19, 0.86]

2 Preterm birth (less than 37 weeks' gestation) Show forest plot

4

276

Risk Ratio (M‐H, Fixed, 95% CI)

0.85 [0.65, 1.10]

3 Very preterm birth (less than 34 weeks' gestation) Show forest plot

1

144

Risk Ratio (M‐H, Fixed, 95% CI)

0.47 [0.15, 1.50]

4 Neonatal mortality Show forest plot

3

Risk Ratio (M‐H, Fixed, 95% CI)

Subtotals only

4.1 Assuming independence between twins

3

452

Risk Ratio (M‐H, Fixed, 95% CI)

0.80 [0.35, 1.82]

4.2 Assuming complete correlation between twins

3

226

Risk Ratio (M‐H, Fixed, 95% CI)

0.82 [0.28, 2.40]

5 Low birthweight (less than 2500 g) Show forest plot

2

Risk Ratio (M‐H, Random, 95% CI)

Subtotals only

5.1 Assuming independence between twins

2

366

Risk Ratio (M‐H, Random, 95% CI)

1.19 [0.77, 1.85]

5.2 Assuming complete correlation between twins

2

183

Risk Ratio (M‐H, Random, 95% CI)

1.09 [0.81, 1.47]

6 Small‐for‐gestational age (birthweight less than 10th centile) Show forest plot

2

Risk Ratio (M‐H, Fixed, 95% CI)

Subtotals only

6.1 Assuming independence between twins

2

178

Risk Ratio (M‐H, Fixed, 95% CI)

0.92 [0.52, 1.65]

6.2 Assuming complete correlation between twins

2

89

Risk Ratio (M‐H, Fixed, 95% CI)

0.92 [0.42, 2.05]

7 Birthweight Show forest plot

3

478

Mean Difference (IV, Fixed, 95% CI)

111.22 [22.21, 200.24]

8 Respiratory distress syndrome Show forest plot

2

Risk Ratio (M‐H, Fixed, 95% CI)

Subtotals only

8.1 Assuming independence between twins

2

388

Risk Ratio (M‐H, Fixed, 95% CI)

0.30 [0.12, 0.77]

8.2 Assuming complete correlation between twins

2

194

Risk Ratio (M‐H, Fixed, 95% CI)

0.35 [0.11, 1.16]

9 Maternal death Show forest plot

1

144

Risk Ratio (M‐H, Fixed, 95% CI)

2.84 [0.12, 68.57]

Figuras y tablas -
Comparison 1. Oral betamimetic versus placebo