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Fig 1.

PRISMA Flowchart of recovery and selection of studies.

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Fig 1 Expand

Table 1.

Characteristics of the studies.

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Table 1 Expand

Fig 2.

Risk of bias for each study.

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Fig 2 Expand

Fig 3.

Risk of bias for all studies.

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Fig 4.

Fetal weight at birth: Analysis by the fixed-effects model and funnel plot.

SD: standard deviation; IV: variance inverse; CI: confidence interval.

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Fig 4 Expand

Fig 5.

Fetal weight at birth—Analysis by the random-effects model.

SD: standard deviation; IV: variance inverse; CI: confidence interval.

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Fig 5 Expand

Fig 6.

Gestational age at birth.

SD: standard deviation; IV: variance inverse; CI: confidence interval.

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Fig 6 Expand

Fig 7.

Umbilical artery pulsatility index—Analysis by the fixed-effects model and funnel plots.

SD: standard deviation; IV: variance inverse; CI: confidence interval.

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Fig 7 Expand

Fig 8.

Umbilical artery pulsatility index—Analysis by the random-effects model.

SD: standard deviation; IV: variance inverse; CI: confidence interval.

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Fig 8 Expand

Fig 9.

Indication of delivery due to fetal distress.

SD: standard deviation; M-H: Mann-Whitney; CI: confidence interval.

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Fig 9 Expand

Fig 10.

Indication of labor due to maternal laboratory test abnormality.

SD: standard deviation; M-H: Mann-Whitney; CI: confidence interval.

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Fig 10 Expand

Fig 11.

Indication of delivery due to imminent eclampsia.

SD: standard deviation; M-H: Mann-Whitney; CI: confidence interval.

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Fig 11 Expand

Fig 12.

Neonatal mortality.

SD: standard deviation; M-H: Mann-Whitney; CI: confidence interval.

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Fig 12 Expand

Fig 13.

Headache as a side effect—Analysis by the fixed-effects model and funnel plots.

SD: standard deviation; M-H: Mann-Whitney; CI: confidence interval.

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Fig 13 Expand

Fig 14.

Headache as a side effect—Analysis after removing the outlier.

SD: standard deviation; M-H: Mann-Whitney; CI: confidence interval.

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Fig 14 Expand