Table 2.

Characteristics of Study Participants

CharacteristicsStudy GroupControl Group
n 1818
Boys1313
Girls55
Age in months146.8 (28.5)147.8 (27.2)
Mother's education*
 1–296
 3–4812
  • * 1 = the lowest level, 4 = the highest level; χ2(1,33) = 2.0, not statistically significant; in the study group, one mother had died.