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Table 2 Demographic characteristics and relevant covariates of study participants

From: Impact of prenatal tobacco smoking on infant telomere length trajectory and ADHD symptoms at 18 months: a longitudinal cohort study

Demographic outcome, mean (SD) Total (N = 181) No prenatal smoking (n = 152) Prenatal smoking (n = 29) p-value
Maternal conception age (year) 28.64 (5.62) 28.38 (5.68) 29.97 (5.19) 0.17
Infant birthweight (kg) 3.26 (0.57) 3.29 (0.58) 3.11 (0.52) 0.15
SES 3.07 (1.94) 3.20 (1.92) 2.35 (1.90) 0.028
  % (n) % (n) % (n)  
Race     0.24
 Black 51.9 (94) 88.3 (83) 11.7 (11)  
 White 37.0 (67) 79.1 (53) 20.9 (14)  
 Other 11.1 (20) 80.0 (16) 20.0 (4)  
Baby sex     0.98
 Male 51.9 (94) 84.0 (79) 16.0 (15)  
 Female 48.1 (87) 83.9 (73) 16.1 (14)  
Pregnancy complications     0.26
 No 82.3 (149) 82.5 (123) 17.5 (26)  
 Yes 17.7 (32) 90.6 (29) 9.4 (3)  
Maternal postnatal depression (18 months)     0.26
 No 85.8 (133) 88.0 (117) 12.0 (16)  
 Yes 14.2 (16) 59.1 (13) 40.9 (9)