Table 5 Factors independently associated with sPTB: multivariate analyses by non-conditional logistic regression.

From: Clinical and epidemiological factors associated with spontaneous preterm birth: a multicentre cohort of low risk nulliparous women

Variables

RRadj

95% CI

p-value

Cervical Length from 18 to 24 weeks <25 mm*

4.52

1.08–19.01

0.043

  1. Variables included in the model: age (years); marital status; alcohol drinking; previous maternal conditions; initial BMI; Cervical length (<25 mm); vaginal bleeding in the first half of pregnancy; urinary tract infection in the first half of pregnancy; weight gain rate per week (kg) 20–27 weeks >p90; Preeclampsia. *Cervical length: Coefficient: 1.51, Standard error: 0.517; Constant: Coefficient: −2.67, Standard error: 0.138.
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