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Table 2 Descriptive characteristics of mothers and their newborn infants byneighbourhood economic status (N = 327901)

From: Are there differences in birth weight between neighbourhoods in a Nordic welfare state?

Variable n per variable (% of total) Affluent neighbourhoods Medium neighbourhoods Poor neighbourhoods Test of significance (ANOVA or CHI-square)
Birthweight (g) 326469 3603 3572 3497 F = 734.8, df = 2,
Mean (SD) (99.6%) (536) (549) (556) p < 0.001
Maternal height (cm) 291555 167.8 167.0 164.8 F = 3954.8, df = 2,
Mean (SD) (88.9%) (6.1) (6.1) (6.6) p < 0.001
Gestational length 327402     Chi-value = 90.8,
   22–28 weeks (99.8%) 0.2% 0.2% 0.2% df = 8
   29–32 weeks   0.5% 0.6% 0.7% P < 0.001
   33–36 weeks   3.4% 3.8% 4.1%  
   37–41 weeks   95.1% 94.4% 93.9%  
   ≥ 42 weeks   0.8% 1.0% 1.1%  
Parity 327901     Chi-value= 4354.0,
   1 (100%) 38.5% 45.5% 40.7% df = 4
   2–3   57.7% 50.2% 49.6% P < 0.001
   ≥ 4   3.8% 4.4% 9.7%  
Maternal age 327901     Chi-value= 15673.7,
   12–19 yrs (100%) 0.3% 1.0% 2.8% df = 10
   20–24 yrs   4.4% 11.6% 22.0% P < 0.001
   25–29 yrs   26.2% 35.1% 35.1%  
   30–34 yrs   43.7% 35.2% 26.4%  
   35–39 yrs   21.4% 14.5% 11.4%  
   ≥ 40 yrs   4.0% 2.7% 2.3%  
Smoking habits 301715     Chi-value= 3637.5,
   0 cig/day (92.0%) 92.7% 85.6% 79.8% df = 4
   1–9 cig/day   5.2% 9.4% 12.3% P < 0.001
   ≥ 10 cig/day   2.1% 5.0% 7.9%  
Maternal education 321230     Chi-value= 30688.3,
   Elementary (98.0%) 5.1% 11.1% 27.7% df = 8
   Secondary (2 yrs)   36.5% 49.6% 50.6% P < 0.001
   Secondary (3–4 yrs)   23.8% 20.0% 12.3%  
   University   34.6% 19.3% 9.4%  
  1. SD = standard deviation.