Observed invasive cervical cancer cases by smoking status, marital status and community health service area urban–rural classification compared with expected cases relative to the general female population in British Columbia
| Category | Observed cases (crude proportion, %) | Census age-standardized weighted proportion, % (95% CI) | Expected cases | Standardized ratio* (95% CI) | Test statistics, χ2† |
|---|---|---|---|---|---|
| Smoking status, n = 1191 | 22.8‡ | ||||
| Current smoker | 229 (19.2) | 14.4 (14.3–14.5) | 172 | 1.34 (1.33–1.34) | |
| Former smoker | 429 (36.0) | 39.0 (38.9–39.1) | 464 | 0.92 (0.92–0.93) | |
| Never smoker | 533 (44.8) | 46.6 (46.5–46.7) | 555 | 0.96 (0.96–0.96) | |
| Marital status, n = 1203 | 26.2‡ | ||||
| Married | 725 (60.3) | 67.2 (67.0–67.3) | 808 | 0.90 (0.90–0.90) | |
| Widowed, separated or divorced | 289 (24.0) | 19.5 (19.4–19.6) | 235 | 1.23 (1.23–1.24) | |
| Single | 189 (15.7) | 13.3 (13.3–13.4) | 160 | 1.18 (1.17–1.18) | |
| CHSA classifications, n = 1683 | 239.2‡ | ||||
| Metro | 766 (45.5) | 50.5 (50.4–50.6) | 850 | 0.90 (0.90–0.90) | |
| Large urban | 244 (14.5) | 15.1 (15.1–15.2) | 255 | 0.96 (0.95–0.96) | |
| Medium urban | 240 (14.3) | 16.5 (16.5–16.6) | 278 | 0.86 (0.86–0.87) | |
| Small urban | 130 (7.7) | 8.9 (8.9–9.0) | 150 | 0.86 (0.86–0.87) | |
| Rural-hub | 87 (5.2) | 4.0 (4.0–4.0) | 67 | 1.29 (1.28–1.30) | |
| Rural or remote | 216 (12.8) | 4.9 (4.9–4.9) | 82 | 2.62 (2.61–2.64) |
Note: CHSA = community health service area, CI = confidence interval, ICC = invasive cervical cancer.
↵* The standardized ratio was derived by dividing the observed and age-adjusted expected counts.
↵† Goodness-of-fit testing the null of no differences between observed and expected values.
↵‡ p <0.001.