Table 2. Regression analysis of factors associated with preterm labor.

Factor	Exp (B)	95% CI	p value
Median steps per day	1.001	1.000–1.001	0.02
Maternal age	1.071	0.919–1.249	0.38
Gestational age at recruitment	1.125	0.801–1.581	0.49
Pregestational BMI	1.059	0.832–1.335	0.64
Cervical length	1.011	0.765–1.335	0.94
Cervical dilatation	0.142	0.01–2.05	0.15
Plurality	0.396	0.069–2.272	0.29

BMI—Body Mass Index