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Table 1 Characteristics of mothers with and without depression (N = 107587)

From: Association between perinatal depression in mothers and the risk of childhood infections in offspring: a population-based cohort study

  Maternal perinatal depression*
  No (n = 97,815)
N (%)
Yes (n = 9,772)
N (%)
χ2(df) P
Maternal age at birth of child (years)
   Mean (Standard deviation) 29.2 (5.6) 28.6 (5.9) tα = 9.5 (107585) < 0.001
Maternal body mass index (kg/m2)
   Normal (18.5-24.9) 37971 (38.8) 4069 (41.6) 575.9 (4) < 0.001
   Underweight (<18.5) 2660 (2.7) 395 (4.0)   
   Overweight (25-29.9) 12093 (12.4) 1502 (15.4)   
   Obese (>30) 5653 (5.8) 910 (9.3)   
   Missing 39438 (40.3) 2896 (29.6)   
Maternal smoking
   Non-smoker 47266 (48.3) 3952 (40.4) 1300 (3) < 0.001
   Ex-smoker 4698 (4.8) 567 (5.8)   
   Current smoker 19985 (20.4) 3463 (35.4)   
   Missing 25866 (26.4) 1790 (18.3)   
Household socioeconomic status
   1 (Least deprivation) 16028 (16.4) 1112 (11.4) 419.1 (5) < 0.001
   2 11714 (12.0) 972 (10.0)   
   3 11170 (11.4) 1106 (11.3)   
   4 9298 (9.5) 1214 (12.4)   
   5 (Most deprivation) 7063 (7.2) 1078 (11.0)   
   Missing 42542 (43.5) 4290 (43.9)   
Caesarean section delivery 13604 (13.9) 1616 (16.5) 50.6 (1) < 0.001
Sex of the child
   Male 50192 (51.3) 4922 (50.4) 3.2 (1) 0.075
  1. * Mothers with either depression diagnosis and/or at least one antidepressant prescription either during pregnancy and/or in the first six months after the child's delivery.
  2. Degrees of freedom
  3. α Student t-test statistic