The effectiveness of a Pilates exercise program during pregnancy on childbirth outcomes: a randomised controlled clinical trial

Table 4 The effect of maternal body mass index on the duration of labor^** based on Cox model

Variable	Beta	Std. Error	95% Confidence Interval		Hazard Ratio	z	P-value^*
Variable	Beta	Std. Error	Lower Bound	Upper Bound	Hazard Ratio	z	P-value^*
BMI	.287	.082	.126	.448	1.33	3.50	<.001

*The duration of labor considering the maternal body mass index was analyzed by using Cox regression analysis; **the sum of the duration of the active phase and the second stage of labor

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