Mean

One child

Mean

(other families)

SD

One child

SD

Other families

t

SE

194.95

182.98

23.32

20.39

6.75****

A

78.20

70.07

10.40

10.55

9.60****

B

79.70

75.21

10.33

10.02

5.47****

C

81.69

80.40

10.94

9.77

1.54

D

68.06

65.86

10.09

10.49

2.65**