Table 2 Baseline demographic characterization data

Age, years (M ± SD)

2

73.1 ± 7.8

74.4 ± 7.7

0.182

67.2 ± 8.9

72.5 ± 7.9

< 10^–7*

3

72.5 ± 7.6

74.9 ± 7.6

<0.006^*

66.6 ± 8.8

72.3 ± 8.2

< 10^–10*

4

72.1 ± 7.3

74.8 ± 7.6

<0.004^*

65.5 ± 9.1

71.9 ± 8.3

< 10^–12*

Formal Education, years (M ± SD)

2

15.9 ± 2.7

16.2 ± 2.7

0.483

10.0 ± 4.7

8.9 ± 5.0

< 10^–7*

3

16.2 ± 2.7

16.0 ± 2.7

0.715

10.1 ± 4.8

8.6 ± 4.8

<0.003^*

4

16.1 ± 2.8

16.0 ± 2.6

0.895

10.4 ± 4.7

8.8 ± 4.8

<0.001^*

Gender (male/female)

2

183/128

48/41

0.408

151/258

39/57

0.499

3

136/99

64/47

0.969

119/191

50/93

0.483

4

82/61

70/52

0.995

85/142

60/115

0.513