Technology-free predictors of preterm birth in singleton women with threatened preterm labor: a prospective cohort study

Table 5 Predictors of preterm delivery among hospitalized singleton women with threatened preterm labor (188 preterm births out of 371 participants)

Predictors	n (%)	aOR (95% CI)^a	P
Rupture of membranes at admission	65 (17.5)	11.7 (5.4 to 25.6)	< 0.001
Cervical dilatation	143 (38.5)	4.1 (2.4 to 7.0)	< 0.001
Grand multigravida (gravidity ≥ 6)	7 (1.9)	27.4 (2.8 to 264.3)	0.004
Experience of psychological violence during pregnancy	127 (34.2)	2.0 (1.1 to 3.2)	0.009
Vaginal bleeding or spotting at admission	46 (12.4)	2.1 (1.2 to 4.0)	0.013
Abnormal result(s) in routine early pregnancy tests	86 (23.2)	1.7 (1.1 to 2.8)	0.024
Woman age ≤ 19 years	36 (9.7)	2.2 (1.1 to 4.5)	0.026

^a Using logistic regression adjusted (Adjusted Odds Ratios) for all 16 factors with p < 0.2 in the unadjusted analysis. We did not enter experience of any kind of violence in the model because of its high collinearity (VIF = 6.6), with the other kind of violence. Excluded factors; weight gain during pregnancy, gestational age less than 28 weeks at admission, vaginal bleeding during pregnancy, high perceived stress, sexual intercourse during last week before admission, history of preterm birth in mother, leukocytosis, uterine contraction, experience of physical violence during pregnancy. P = 0.987 for Hosmer & Lemeshow test of the goodness of fit, Nagelkerkes R² = 0.336

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