Table 1.
Study population
| Control classes | Total controls | Intervention | Total | |||
|---|---|---|---|---|---|---|
| 2007 | 2008 | 2009 | 2012 | |||
| Starting class size, n | 19 | 40 | 18 | 77 | 32 | 109 |
| RA drop-outs | ||||||
| Injury, n (%) | 1 (5.3) | 0 | 1 (5.6) | 2 (2.6) | 1 (3.1) | 3 (2.8) |
| Other, n (%) | 8 (42.1) | 5 (12.5) | 1 (5.6) | 14 (18.2) | 4 (12.5) | 18 (16.5) |
| Prob. year drop-out, n (%) | 1 (5.3) | 1 (2.5) | 2 (11.1) | 4 (5.2) | 0 | 4 (3.7) |
| Successful completion, n (%) | 9 (47.4) | 34 (85.0) | 14 (77.8) | 57 (74.0) | 27 (84.4) | 84 (77.1)* |
| Age, mean (SD)† | 25.3 (3.4) | 28.2 (5.8) | 29.3 (6.1) | 28.0 (5.7) | 28.4 (5.1) | 27.5 (5.3) |
| Female, n (%) | 3 (15.8) | 0 | 2 (11.1) | 5 (6.5) | 1 (3.1) | 4 (3.7)‡ |
*Successful completion differed significantly by year, p=0.013.
†Age at time of pre-employment physical. These data are missing for many recruits who failed to complete the RA. 2007: n=10; 2008: n=36; 2009: n=16; 2012, n=28 (p=0.41).
‡Total does not equal column totals: one female participated in the 2007 and 2009 RAs; another female participated in the 2009 and 2012 RAs. These are treated as independent observations for the statistical tests (p=0.025).
RA, recruit academy.