Table 1 Participant characteristics by enrollment group
Variable | Reduced likelihood (RL) Mean (SD) | Increased likelihood (IL) mean (SD) | Statistics |
|---|---|---|---|
Age at 12-mo visit, in months | 12.43 (.39) | 12.38 (.61) | t = .37, p = .71 |
Age at 18-mo visit, in months | 18.30 (.48) | 18.56 (.83) | t = .34, p = .25 |
Age at 24-mo visit, in months | 24.18 (.25) | 24.77 (1.48) | t = .78, p = .44 |
Sex (n boys:girls) | 14:7 | 34:26 | X2 = .64, p = .42 |
Ethnicity | 80% Caucasian | 62% Caucasian | X2 = 6.28, p = .62 |
15% Mixed | 12% Mixed | ||
0% Middle Eastern | 7% Middle Eastern | ||
0% Black | 5% Black | ||
0% Aboriginal | 3% Aboriginal | ||
5% Filipino | 2% Filipino | ||
0% other | 9% other | ||
Marital status | 85% married | 73% married | X2 = 4.28, p = .23 |
5% common law | 14% common law | ||
10% separated | 4% separated | ||
0% never lived together | 9% never lived together | ||
Household income | 5% less than $40,000 | 7% less than $40,000 | X2 = 17.63, p = .06 |
15% $40,001 – $80,000 | 31% $40,001 – $80,000 | ||
45% $80,001 – $125,000 | 16% $80,001 – $125,000 | ||
25% $125,001 – $200,000 | 27% $125,001 – $200,000 | ||
10% $200,001 and higher | 5% $200,001 and higher | ||
0% not given | 14% not given |