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Table 1 Characteristics of the study population

From: Prevalence of suspected developmental delays in early infancy: results from a regional population-based longitudinal study

       Children
  4 months 6 months 12 months
  n = 1244 % n = 1192 % n = 832 %
Gendera       
Girls 562 48.6 525 47.6 372 48.5
Boys 594 51.4 579 52.4 395 51.5
Gestational age < 37 weekb 66 5.9 59 5.5 42 5.8
Birth Weight < 2500 grc 48 4.2 40 3.6 21 2.7
       Mothers
  4 months 6 months 12 months
  n = 1244 % n = 1192 % n = 832 %
Married or cohabitantsd 1108 95.7 1060 95.8 746 96.5
Higher educatione,f 726 64.0 702 64.9 524 70.0
  1. aGender has 1156 valid values at 4 months, 1104 at 6 months and 767 at 12 months, when at least one ASQ area is validity answered
  2. bGestation age 4 months (n = 1113) : range 26- 42 weeks, mean 39.5 weeks. Gestation age 6 months (n = 1065): range = 27-42 weeks, mean 39.5 weeks. Gestation age 12 months (n = 727): range 27-42 weeks, mean 39.5 weeks, when at least one ASQ question is validity answered
  3. cBirth Weight 4 months (n = 1156): range = 772-5180 gr, mean = 3530 gr, 6 months (n = 1103): range = 966- 5180 gr, mean = 3547 gr, 12 months (n = 766): range = 966-5040 gr, mean = 3566 gr, when at least one ASQ question is validity answered
  4. dMarital status has 1158 valid values at 4 months, 1106 at 6 months and 769 at 12 months,when at least one ASQ question is validity answered
  5. eHigher education: Had qualified from, or studied at the university or college
  6. fEducation has 1134 valid values at 4 mo, 1108 at 6 mo and 749 at 12 mo, when at least one ASQ area is validity answered