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Table 1 Demographic information at 18 months

From: The relationship between the development of social competence and sleep in infants: a longitudinal study

Items 18 months (n = 207)
n %
Genders
 Boys 102 49.3
 Girls 105 50.7
Siblings
 0 103 49.8
 1 80 38.6
 2 21 10.1
 3 1 0.5
 No answer 2 1.0
Family type
 Nuclear family 177 85.5
 Extendend family 28 13.5
 No answer 2 1.0
Mother’s age
 20–29 54 26.1
 30–39 143 69.1
 40–49 10 4.8
 No answer
Father’s age
 20–29 36 17.4
 30–39 138 66.7
 40–49 24 11.6
 50– 1 0.5
 No answer 8 3.9
Mother’s career
 No 67 32.4
 Yes 114 55.1
 No answer 26 12.6
Family annual income
 < 2 million JPY 34 16.4
 2–4 million JPY 46 22.2
 4–6 million JPY 85 41.1
 6–8 million JPY 26 12.6
 8–10 million JPY 9 4.4
 ≥ 10 million JPY 7 3.4
 No answer
Using child care center
 No 78 37.7
 Yes 125 60.4
 No answer 4 1.9
  1. JPY Japanese yen