Table 1.
IQ in relation to indicators of socio-economic status in the VES (n = 4289)
| No. of men | AGTT (wave 1) |
AGTT (wave 2) |
|||
|---|---|---|---|---|---|
| Mean (SD) | P-trend | Mean (SD) | P-trend | ||
| Army income (USD/month) | |||||
| 83–119 | 536 | 95.8 (18.5) | 100.6 (21.1) | ||
| 120–144 | 2121 | 103.1 (20.3) | 107.6 (22.2) | ||
| 145 | 1632 | 113.3 (18.7) | <0.001 | 118.0 (19.2) | <0.001 |
| Education attainment | |||||
| Grade ≤11 | 523 | 86.5 (16.4) | 90.0 (20.4) | ||
| Grade 12 | 1573 | 100.3 (17.1) | 104.5 (19.7) | ||
| Grade ≥13 | 2193 | 114.9 (18.6) | <0.001 | 120.0 (18.4) | <0.001 |
| Family income (USD/year) | |||||
| ≤20 000 | 1219 | 96.4 (19.8) | 99.8 (22.7) | ||
| 20 001–40 000 | 2141 | 106.4 (18.9) | 111.5 (20.0) | ||
| >40 000 | 929 | 117.9 (18.0) | <0.001 | 123.1 (17.0) | <0.001 |
| Occupational prestigea | |||||
| Q1 (lowest) | 990 | 96.9 (19.1) | 100.4 (21.7) | ||
| Q2 | 1151 | 99.4 (19.1) | 103.9 (21.7) | ||
| Q3 | 1046 | 108.5 (18.3) | 114.0 (18.9) | ||
| Q4 | 1102 | 119.0 (17.4) | <0.001 | 123.8 (16.5) | <0.001 |
aOccupational prestige is a continuous variable that was categorized here for ease of presentation.