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.