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Table 1 Characteristics of the study population at delivery and at 4 years of age follow-up

From: A longitudinal study of environmental tobacco smoke exposure in children: Parental self reports versus age dependent biomarkers

  At delivery N = 415 4 year N = 306 p-value*
Parents:    
   Maternal age at birth, mean (SD) 29.1 (5.4) 29.8 (5.3) NS
   Father's social class, (%)    
Professional 6.2 7.0 NS
Managerial and technical 10.7 10.9 NS
Skilled (non-manual) 40.9 38.5 NS
Skilled (manual) 22.7 24.1 NS
Partly skilled 16.9 16.0 NS
Unskilled 2.6 3.5 NS
   Maternal country, Spain (%) 74.5 81.0 0.01
Neonates:    
   Sex, male (%) 51.1 53.1 NS
   Birth weight (g), mean (SD) 3242.0 (481.7) 3180.4 (492.5) NS
   Length (cm), mean (SD) 49.2 (2.1) 49.1 (2.4) NS
   Craneal perimeter (cm), mean (SD) 34.4 (1.5) 34.2 (1.6) NS
   Low weight (<2500 g), (%) 6.3 8.2 NS
   Premature (<37 weeks), (%) 5.8 7.8 NS
  1. NS: no significance