Table 1b. Baseline characteristics of cases and controls.
|
Case
|
Control
|
|||||
|---|---|---|---|---|---|---|
| Variable | n | Mean (s.d.) | % | n | Mean (s.d.) | % |
| Age at prostate check clinic | 1089 | 62.3 (5.0) | 5013 | 62.1 (5.0) | ||
| Missing | 0 | 0.0 | 7 | 0.1 | ||
| Height (m) | 1078 | 1.76 (0.07) | 4976 | 1.76 (0.07) | ||
| Missing | 11 | 1.0 | 44 | 0.9 | ||
| Ethnicity | ||||||
| White | 1055 | 96.9 | 4927 | 98.1 | ||
| Other | 2 | 1.1 | 48 | 1.0 | ||
| Missing | 22 | 2.0 | 45 | 0.9 | ||
| Social class | ||||||
| Working | 345 | 31.7 | 1560 | 31.1 | ||
| Intermediate | 131 | 12.0 | 583 | 11.6 | ||
| Professional | 370 | 34.0 | 1722 | 34.3 | ||
| Missing | 243 | 22.3 | 1155 | 23.0 | ||
| Family history in first degree relatives | ||||||
| Yes | 88 | 8.1 | 259 | 5.2 | ||
| No | 888 | 81.5 | 4330 | 86.2 | ||
| Missing | 113 | 10.4 | 431 | 8.6 | ||
| PSA at PCC (ng ml−1) | 1089 | 8.85 (28.1) | 5020 | 1.40 (1.4) | ||
| Missing | 0 | 0.0 | 0 | 0.0 | ||
| Stage | ||||||
| Localised | 970 | 89.1 | ||||
| Advanced | 111 | 10.2 | — | — | ||
| Missing | 8 | 0.7 | ||||
| Grade | ||||||
| Low | 736 | 67.6 | ||||
| Intermediate | 288 | 26.4 | ||||
| High | 59 | 5.4 | — | — | ||
| Missing | 6 | 0.6 | ||||
Abbreviations: PCC=prostate check clinic; PSA=prostate-specific antigen.