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Table 2 Sample demographics for CogBIAS longitudinal study (Wave 1) by cohort group

From: The CogBIAS longitudinal study protocol: cognitive and genetic factors influencing psychological functioning in adolescence

Variable

Total

X1

X2

X3

X4

X5

X6

X7

X8

X9

X10

N

504

15

30

62

47

13

34

119

104

54

26

Age (M, SD)

12.9 (.9)

12.0 (.5)

11.3 (.4)

12.9 (.4)

12.9 (.3)

11.9 (.5)

12.3 (.5)

13.5 (.6)

12.6 (.7)

13.9 (.5)

12.7 (.5)

Year group (range)

7–9

7

7

8

8

8

8

9

8

9

8

Gender (% female)

55.2

40.0

50.0

100.0

100.0

100.0

47.1

0.0

100.0

0.0

57.7

Ethnicity (% Caucasian)

78.9

93.3

86.7

72.6

80.8

69.5

61.1

89.1

71.1

83.4

96.1

Mother’s education level (M, SD)

3.6 (1.3)

3.9 (1.4)

2.9 (1.4)

3.6 (1.1)

2.9 (1.4)

4.1 (1.4)

2.4 (1.1)

4.2 (1.1)

3.9 (1.0)

3.5 (1.5)

3.0 (1.2)