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Table 5 Multivariate analysis of smoking and birth weight of full-term infants (n = 1124)

From: Smoking during pregnancy and harm reduction in birth weight: a cross-sectional study

Variable

β

SE

p

CI (β; 95%)

(Intercept)

− 750.57

927.63

0.000

(− 2568.70 to 1067.55)

Smoking in pregnancy

 Yes, 11 to 40 cigarettes per day

−435.01

152.12

0.004

(−733.16 to −136.87)

 Yes, 6 to 10 cigarettes per day

−320.41

109.74

0.004

(−535.51 to − 105.32)

 Yes, 1 to 5 cigarettes per day

54.81

150.09

0.715

(− 348.99 to 239.37)

No

   

reference

Live with a partner

 Yes

93.46

92.59

0.313

(−88.01 to 274.920

 No

   

reference

Prenatal care in public service

 Yes

−1.10

72.10

0.988

(− 142.42 to 140.21)

 No

   

reference

≥ 7 prenatal medical visits

    

 Yes

125.21

80.30

0.119

(−32.18 to 282.60)

 No

   

reference

Illegal drug use

 Yes

− 445.41

385.79

0.248

(− 1201.55 to 310.73)

 No

   

reference

Emotional problems

 Yes

127.67

72.15

0.077

(−13.74 to 269.08)

 No

   

reference

Anemia

 Yes

−3.09

99.58

0.975

(−198.27 to 192.09)

 No

   

reference

High blood pressure/pre-eclampsia/eclampsia/ HELLP syndromea

 Yes

19.75

91.79

0.830

(− 160.15 to 199.66)

 No

   

reference

Hyperemesis

 Yes

− 143.85

134.86

0.286

(− 408.18 to 120.47)

 No

   

reference

Infection

 Yes

−53.29

70.23

0.448

(− 190.95 to 84.36)

 No

   

reference

Age at delivery (years)

−0.77

6.14

0.900

(−12.80 to 11.25)

Gestational age (weeks)

111.48

11.23

< 0,001

(−12.80 to 11.25)

Interval between deliveries (years)

4.56

8.04

0.571

(−11.19 to 20.31)

  1. aHELLP hemolysis, elevated liver enzymes, low platelet count