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

Table 1 Characteristics of the study population

^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
^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
^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
^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
^eHigher education: Had qualified from, or studied at the university or college
^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

ISSN: 1471-2431