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. 2020 Nov 30;20:902. doi: 10.1186/s12879-020-05640-0
Variables Hazard Ratio Event P(e) Sample size
Hypertension disorder 2.9 7 0.083 86 [24]
Prolonged duration of labor 2.73 8 0.02 400 [24]
Duration of procedure 1.83 22 0.045 489