Table 3. HR (95% CI) for the relation of IQ with method-specific assault.
| IQ score1 | N (assault / no assault) | Adjusted for age | Multiple adjustment excluding education 2 | Multiple adjustment including education 3 |
|---|---|---|---|---|
| Fight or brawl | ||||
| 7-9 | 1,569 / 288,143 | 1.00 | 1.00 | 1.00 |
| 5-6 | 4,543 / 443,851 | 1.93 (1.82, 2.04) | 1.69 (1.59, 1.79) | 1.36 (1.28, 1.45) |
| 3-4 | 4,503 / 272,924 | 2.95 (2.79, 3.13) | 2.45 (2.30, 2.60) | 1.76 (1.65, 1.88) |
| 1-2 | 2,529 / 102,926 | 4.40 (4.13, 4.69) | 3.35 (3.13, 3.58) | 2.27 (2.12, 2.44) |
| p 4 | <0.001 | <0.001 | <0.001 | |
| SD decrease | 13,144 / 1,107,844 | 1.60 (1.58, 1.63) | 1.48 (1.45, 1.51) | 1.32 (1.29, 1.35) |
| P | <0.001 | <0.001 | <0.001 | |
| Stabbing assault | ||||
| 7-9 | 112 / 289,600 | 1.00 | 1.00 | 1.00 |
| 5-6 | 372 / 448,022 | 2.22 (1.80, 2.75) | 1.94 (1.57, 2.40) | 1.31 (1.05, 1.64) |
| 3-4 | 435 / 276,992 | 4.08 (3.31, 5.02) | 3.27 (2.63, 4.05) | 1.79 (1.43, 2.24) |
| 1-2 | 292 / 105,163 | 7.16 (5.76, 8.91) | 5.09 (4.04, 6.40) | 2.47 (1.94, 3.15) |
| p 4 | <0.001 | <0.001 | <0.001 | |
| SD decrease | 1,211 / 1,119,777 | 1.87 (1.76, 1.98) | 1.68 (1.58, 1.79) | 1.36 (1.28, 1.46) |
| P | <0.001 | <0.001 | <0.001 | |
| Blunt instrument assault | ||||
| 7-9 | 33 / 289,679 | 1.00 | 1.00 | 1.00 |
| 5-6 | 112 / 448,282 | 2.18 (1.48, 3.21) | 1.91 (1.28, 2.83) | 1.35 (0.90, 2.03) |
| 3-4 | 121 / 277,306 | 3.79 (2.58, 5.57) | 3.03 (2.03, 4.52) | 1.77 (1.16, 2.70) |
| 1-2 | 86 / 105,369 | 7.05 (4.72, 10.53) | 4.87 (3.19, 7.43) | 2.54 (1.62, 3.99) |
| p 4 | <0.001 | <0.001 | <0.001 | |
| SD decrease | 352 / 1,120,636 | 1.86 (1.67, 2.07) | 1.65 (1.47, 1.85) | 1.37 (1.20, 1.55) |
| P | <0.001 | <0.001 | <0.001 | |
| Firearms assault | ||||
| 7-9 | 5 / 289,707 | 1.00 | 1.00 | 1.00 |
| 5-6 | 20 / 448,374 | 2.60 (0.98, 6.94) | 2.45 (0.91, 6.64) | 1.56 (0.56, 4.34) |
| 3-4 | 19 / 277,408 | 3.98 (1.48, 10.66) | 3.67 (1.32, 10.22) | 1.83 (0.63, 5.29) |
| 1-2 | 7 / 105,448 | 3.82 (1.21, 12.03) | 3.32 (1.00, 10.96) | 1.46 (0.42, 5.06) |
| p 4 | 0.01 | 0.02 | 0.54 | |
| SD decrease | 51 / 1,120,937 | 1.42 (1.07, 1.86) | 1.34 (1.00, 1.80) | 1.01 (0.73, 1.40) |
| P | 0.01 | 0.05 | 0.94 | |
1
IQ scores are listed from high (7-9) to low (1-2)
2
Adjusted for age, conscription centre, year of birth, childhood SES, adult height, and adult SES
3
Adjusted for age, conscription centre, year of birth, childhood SES, adult height, adult SES, and educational achievement
4
p for trend across 4 categories of IQ