Table 1.
Summary of confounders in relation to subjects' history of drug use at conscription. Values are numbers (percentages) of cohort sample
| Subjects by type of drug use
|
Diagnosis of psychiatric illness on conscription*
|
Disturbed behaviour
|
Low IQ score
|
Brought up in city
|
Cigarette smoking
|
Poor social integration
|
|---|---|---|---|---|---|---|
| Cannabis (n=5391) | 1408 (27) | 1582 (31) | 297 (6) | 2262 (43) | 4582 (86) | 130 (2.5) |
| Cannabis only (n=1648) | 235 (15) | 271 (17) | 65 (4) | 653 (40) | 1331 (81) | 34 (2.1) |
| Any drug (n=11 783) | 2325 (20) | 2557 (23) | 1007 (9) | 3358 (31) | 8835 (80) | 246 (2.3) |
| No drug (n=36 753) | 2827 (8) | 1681 (5) | 3510 (10) | 6759 (19) | 19 229 (52) | 841 (2.4) |
Owing to missing data for each of the confounders, the precentages presented may not tally precisely with the numbers of subjects reported
*
Except psychosis or learning disability.