Table 2 Demographic characteristics of the children and their parents

Children

Age in years

10.6(1.4)

11.07(1.8)

t = 1.52, df = 156, P = 0.1

Number of boys (%)

5373.6%)

61(79.1%)

χ² = 0.63, df = 1, P = 0.4

Number of siblings

1.7(1.1)

2.6(1.3)

t = 4.2, df = 156, P < 0.001

Father

Age in years

42.5(6.8)

41.2(6.3)

t = 1.2, df = 156, P = 0.2

Years of Educational level

9.3(5.3)

10.3(3.5)

t = 1.4, df = 156, P = 0.1

Number of employed (%)

49(96.1%)

78(94.0%)

χ² = 0.02, df = 1, P = 0.5

Mother

Age in years

35.2(6.0)

35.1(5.8)

t = 0.14, df = 145, P = 0.8

Years of Educational level

10.(3.9)

9.4(3.6)

t = 2.03, df = 156, P < 0.04

Number of housewives (%)

84(82.3%)

51(93.3%)

χ² = 4.5, df = 1, P < 0.03