Table 2.
Unadjusted and adjusted* relative risks† and rates of screening for colorectal cancer by age and health status (n=399 067)
| Predictor variable | Unadjusted | Adjusted | |||
|---|---|---|---|---|---|
| RR (95% CI) | Screening rate, % (95% CI) | RR (95% CI) | Screening rate, % (95% CI) | ||
| Age (years): | |||||
| 50-69 | 1 (reference) | 45.9 (45.7 to 46.1) | 1 (reference) | 45.6 (43.7 to 47.4) | |
| 70-75 | 0.93 (0.91 to 0.95) | 42.7 (42.2 to 43.1) | 0.94 (0.92 to 0.96) | 42.9 (40.9 to 44.9) | |
| >75 | 0.34 (0.30 to 0.39) | 15.6 (15.4 to 15.8) | 0.35 (0.30 to 0.40) | 15.8 (13.6 to 18.1) | |
| Charlson comorbidity index‡: | |||||
| 0 | 1 (reference) | 41.0 (40.7 to 41.3) | 1 (reference) | 38.7 (36.8 to 40.5) | |
| 1-3 | 0.92 (0.90 to 0.93) | 37.5 (37.3 to 37.7) | 0.94 (0.93 to 0.95) | 36.0 (34.2 to 37.7) | |
| ≥4 | 0.82 (0.80 to 0.83) | 33.4 (33.0 to 33.8) | 0.87 (0.85 to 0.89) | 33.1 (31.6 to 34.6) | |
*Adjusted for sex and number of primary care visits in 2010; unadjusted results reflect simple proportions within each age or comorbidity group.
†P<0.001 for all comparisons.
‡In a 75 year old man, Charlson index of 0 indicates life expectancy >10 years, 1-3 indicates life expectancy 5-10 years, and ≥4 indicates life expectancy <5 years.