Table 1.
Study Demographics
| Cohort 1. Ascertained 4/4/02–5/27/05 | |||
|---|---|---|---|
| Controls (n=140): | Cases (n=477): | t or χ2 [df]; p value | |
| Mean Age (SEM) | 33.7 (SD= 11.1) | 40.6 (SD=10.6) | t [465]=6; p<0.001 |
| Gender: N (% of total) | |||
| Male | 61 (43.6%) | 324 (67.9%) | χ2=27; p<0.001 |
| Female | 79 (56.4%) | 152 (32.1%) | |
| Depression Diagnosis: N (% of total within gender) | |||
| Male | 4 (1.0%) | 60 (15.6%) | N/A (one cell had low “N”)a |
| Female | 11 (4.8%) | 48 (20.8%) | |
| Ethnic/Cultural Group: N (% of total) | |||
| African-American | 69 (49.3%) | 209 (43.8%) | χ2=6.7; n.s. |
| Caucasian | 41 (29.3%) | 126 (26.4%) | |
| Hispanic | 17 (12.1%) | 105 (22.0%) | |
| Remaining/Mixed | 13 (9.3%) | 37 (7.8%) | |
| Cohort 2. Ascertained 6/9/05–8/1/13 | |||
| Controls (n=163) | Cases (n=421) | t or χ2 [df]; p value | |
| Mean Age (SEM) | 33.0 (SD=11.2) | 44.6 (SD=8.6) | t=[581]11.8; p<0.001 |
| Gender: N (% of total) | |||
| Male | 76 (46.6%) | 257 (61.0%) | χ2=9.97; p<0.002 |
| Female | 87 (53.4%) | 164 (39.0%); n=1 M to F transgender | |
| Depression Diagnosis: N (% of total within gender) | |||
| Male | 3 (1.0%) | 74 (22.2%) | N/A (one cell had low “N”)a |
| Female | 8 (3.1%) | 65 (24.9%) | |
| Ethnic/Cultural Group: N (% of total) | |||
| African-American | 60 (36.8%) | 241 (57.2%) | χ2=24.2; p<0.0001 |
| Caucasian | 41 (25.2%) | 70 (16.6%) | |
| Hispanic | 31 (19.0%) | 72 (17.1%) | |
| Remaining/Mixed | 31 (19.0%) | 38 (9.1%) | |
a
χ2 analysis on the data from both cohorts combined was significant (χ2=7.04; p=0.008).