Table 4 Incidence of spontaneous preterm birth according to some maternal clinical phenotypes.
Maternal clinical phenotypes | Incidence of sPTB | [95% CI] |
|---|---|---|
n/N (%) | ||
Underweight on enrolment (<21.5 kg/m2)* and Weight gain rate per week <Q1 | 4/27 (14.8%) | [0.0–34.7] |
Underweight on enrolment (<21.5 kg/m2)* and Weight gain rate per week <Q2 | 4/52 (7.7%) | [0.0–18.7] |
Obesity (>30.9)* and Weight gain rate per week >Q3 | 3/21 (14.3%) | [3.9–24.6] |
Overweight or Obese* and Weight gain rate per week >Q3 | 6/76 (7.9%) | [4.1–11.7] |
Obesity (>30.9)* and Weight gain rate per week >Q2 | 5/54 (9.3%) | [0.8–17.7] |
Overweight or Obese* and Weight gain rate per week >Q2 | 11/165 (6.7%) | [3.6–9.7] |
Vaginal bleeding and urinary infection in the first half of pregnancy | 3/49 (6.1%) | [0.0–15.1] |
Short Cervical Length from 18 to 24 weeks | 5/16 (31.2%) | [0.0–77.2] |
Short Cervical Length from 18 to 24 weeks and vaginal bleeding in the first half of pregnancy | 2/5 (40.0%) | [0.0–91.6] |
Low family income and schooling levels (a) | 0/42 (0%) | — |
Low family income and schooling levels (b) | 14/261 (5.4%) | [2.6–8.1] |
White, low family income and schooling levels (a) | 0/6 (0%) | — |
White, low family income and schooling levels (b) | 3/48 (6.3%) | [0.0–12.5] |
Non-white, low family income and schooling levels (a) | 0/36 (0%) | — |
Non-white, low family income and schooling levels (b) | 11/213 (5.2%) | [2.0–8.3] |
White, high family income and schooling levels (a) | 11/169 (6.5%) | [3.4–9.7] |
White, high family income and schooling levels (b) | 13/198 (6.6%) | [3.9–9.2] |
Non-white, high family income and schooling levels (a) | 5/77 (6.5%) | [0.0–15.9] |
Non-white, high family income and schooling levels (b) | 9/129 (7.0%) | [0.0–14.8] |
General population of the study | 78/1165 (6.7%) | [4.7–8.7] |
