Table 4 Multiple logistic regression analysis of variables independently associated with spontaneous preterm birth among singleton pregnancies in the EMIP study (n = 1,756).

From: Maternal Work and Spontaneous Preterm Birth: A Multicenter Observational Study in Brazil

Variables

OR

95% CI

p-value

Weight gain during pregnancy (kg)

0.91

0.89–0.93

<0.001

Previous preterm delivery

3.93

2.60–5.95

<0.001

Age (<20 years)

1.71

1.37–2.14

<0.001

BMI < 25 kg/m2

2.14

1.56–2.94

<0.001

Worked up to 8–9th month

0.50

0.37–0.67

<0.001

Worked up to 7th month

1.75

1.30–2.35

<0.002

Polihydramnios

3.71

1.89–7.27

<0.002

Vaginal bleeding during pregnancy

1.75

1.24–2.47

0.003

Anemia during pregnancy

0.74

0.62–0.89

0.003

Household work unaided

0.77

0.65–0.91

0.004

Antenatal care in primary health care unit

1.47

1.04–2.06

0.029

  1. OR: Odds ratio; 95% CI: 95% Confidence interval for OR; p: p-value. Predictive variables considered in the model: Household chores performed in one’s household (Yes, unaided = 1/Yes, aided or No = 0); Paid work1 (Up to 7th month = 1); Paid work2 (Up to 8–9th month = 1); Standing during work (Yes/eventually = 1 or No = 0); Number of working hours (more than 8 h = 1 or up to 8 h = 0); Night shifts (Yes = 1 or Eventually/no = 0); Age (<20 years = 1); Marital status (With a partner = 0 or Without a partner = 1); School education (Up to 8 years = 0 or > 8 years = 1); Family income (Up to R$ 1.000,00 = 1 or > R$ 1.000,00 = 0); Chronic or complicating maternal morbidity (Yes, any condition one = 1 or No = 0); Lives where there is piped water (Yes = 1 or No = 0); Number of children aged less than 5 years (≥1 = 1 or None = 0); Age of youngest child (≥2 years = 1 or No other child/up to 1 year old = 0); BMI at the beginning of pregnancy (<25: 1/≥25 kg/m2:0); Weight gain during pregnancy (kg); Smoked during pregnancy (Yes = 1 or No = 0); Lives with a smoker (Yes = 1 or No = 0); Treatment of urinary tract infection during pregnancy (Yes = 1 or No = 0); Anemia during current pregnancy (Yes = 1 or No = 0); Vaginal bleeding during pregnancy (Yes = 1 or No = 0); Polyhydramnios (Yes = 1 or No = 0); Number of previous caesarean sections (≥1 = 1 or None = 0); Number of previous preterm births (Any = 1 or None = 0); History of hospital admission due to preterm labor (Yes = 1 or No = 0); History of rupture of membranes (Yes = 1 or No: 0); Prenatal care (Primary health care unit=1/ Other = 0).
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