Skip to main content

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)