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Figures
- Figure 1:
Age-standardized incidence rates of cervical cancer and number of new cases by year, 2004–2013. The dashed line shows the provincial cumulative age-standardized incidence rate, 2004–2013, the solid line shows the age-standardized incidence rate and the bars show counts of invasive cervical cancer cases. Note: HAF = health assessment form.
Tables
Population Database Description Years of data used Variables used in analysis BC ICC cases BC Cancer Registry A population-based registry of all cases of cancer diagnosed in BC residents since 1970. Data includes personal, geographic and tumour diagnosis information. Sociodemographic information is available only for cases seen in consultation at a BC Cancer clinic. 2004–2013 Age, geography BC HAFs Health assessment forms are completed upon first admission to a BC Cancer centre. HAFs capture sociodemographic characteristics via a standardized questionnaire. HAF: 2004–2010
PRISM: 2011–2013Self-reported ethnicity or race, language, smoking status, marital status General population of women in BC Canadian Census PUMF (individuals file) The Canadian Census of Population is a primary source of sociodemographic data in Canada and vital for government, community and planning services.21 The 2006 Census national response rate was 96.5%.22 The public use microdata file contains 844 476 records, representing 2.7% of the Canadian population. The file does not include people living in institutions.23 2006 Self-reported age, ethnicity or race, language National Household Survey PUMF (individuals file) In 2011, the mandatory long-form census was replaced with a voluntary survey called the National Household Survey (NHS). The NHS collected similar information as gathered from the Census. The national response rate in 2011 was 77.2%.24 Statistics Canada implemented various methods to account for error and biases related to the voluntary nature of the survey.25 The 2011 NHS PUMF on individuals represents a 2.7% sample of the Canadian population. It contains social, demographic and economic data.26 2011 Self-reported age, ethnicity or race, language CCHS PUMF The CCHS is a national cross-sectional survey that collects health information and is conducted every 2 years by Statistics Canada. The survey uses multistage cluster sampling and collects data on “health and social characteristics of the population.” The CCHS PUMF provides data on a 2-year period. The response rate was 68.4%. Data are based on in-person and telephone interviews administered to participants, with about 130 000 respondents aged 12 years or older, residing in households in all provinces and territories. Data are not collected on members of the Canadian Armed Forces and those residing on First Nations reserves, in institutions and in some remote regions. Exclusions represent less than 3% of the Canadian population.27 2011/12 cycle Self-reported smoking status, marital status BC Stats28 Population statistics by BC geographical classifications. BC Stats provides population estimates by various levels of geography. Population estimates are based on the Census of Population with adjustments that consider net under-enumeration in the Census.29 2006, 2011 Geography Note: BCCR = BC Cancer Registry, CCHS = Canadian Community Health Survey, HAF = health assessment form, ICC = invasive cervical cancer, PRISM = Patient-Reported Information and Symptom Measurement, PUMF = public use microdata file.
- Table 2:
Age distribution of invasive cervical cancer cases and general female population in British Columbia, 2004–2013
Age group, yr BC Cancer ICC cases* (all cases in BC)
No. (%)
n = 1705BC Cancer ICC cases* (referred with complete HAFs)
No. (%)
n = 1215BC female population 18 yr and older† % 18–24 13 (0.8) 5 (0.4) 11.8 25–29 87 (5.1) 40 (3.3) 8.0 30–34 165 (9.7) 92 (7.6) 7.8 35–39 209 (12.3) 154 (12.7) 8.4 40–44 269 (15.8) 188 (15.5) 9.4 45–49 195 (11.4) 145 (11.9) 10.2 50–54 166 (9.7) 123 (10.1) 9.9 55–59 164 (9.6) 124 (10.2) 9.2 60–64 118 (6.9) 94 (7.7) 7.7 65–69 89 (5.2) 78 (6.4) 5.6 70–74 64 (3.8) 47 (3.9) 4.4 75–79 62 (3.6) 50 (4.1) 3.6 80–84 65 (3.8) 48 (4.0) 2.4 ≥ 85 39 (2.3) 27 (2.3) 1.5 Note: HAF = health assessment form, ICC = invasive cervical cancer.
↵* Only ICC cases aged 18 years and older were considered.
↵† Data for the BC female population aged 18 years and older were derived by adding weighted counts for each age group from the 2006 Census23 and 2011 NHS.26 To derive proportions, the weighted counts were divided by the total of weighted counts among ages 18 years and older.
- Table 3:
Observed invasive cervical cancer cases by self-identified ethnicity or race and language most often spoken at home 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† Ethnicity or race Overall, n = 1117 22.8¶ Not a visible minority 797 (71.3) 77.3 (77.2–77.4) 864 0.92 (0.92–0.92) Visible minority 320 (28.6) 22.7 (22.6–22.7) 253 1.26 (1.26–1.26) Within not a visible minority, n = 797 55.9¶ White 712 (89.3) 95.1 (94.9–95.2) 758 0.94 (0.94–0.94) Indigenous 85 (10.7) 4.9 (4.9–5.0) 39 2.16 (2.15–2.18) Within visible minority, n = 320 38.8¶ Chinese 118 (36.9) 35.4 (35.2–35.6) 113 1.04 (1.04–1.05) South Asian 72 (22.5) 35.9 (35.8–36.1) 115 0.63 (0.62–0.63) Filipino 38 (11.9) 7.4 (7.4–7.5) 24 1.60 (1.58–1.62) Korean 21 (6.6) 3.7 (3.6–3.7) 12 1.78 (1.76–1.80) Japanese 17 (5.3) 3.0 (3.0–3.1) 10 1.77 (1.74–1.79) All other‡ 54 (16.9) 14.5 (14.4–14.6) 47 1.16 (1.15–1.17) Language Overall, n = 1081 1.2 Official languages§ 901 (83.3) 82.1 (82.0–82.2) 887 1.02 (1.01–1.02) Nonofficial languages 180 (16.7) 17.9 (17.9–18.0) 194 0.93 (0.93–0.93) Within nonofficial languages, n = 180 12.6** Chinese languages 80 (44.4) 41.7 (41.5–41.9) 75 1.07 (1.06–1.07) Punjabi 45 (25.0) 18.4 (18.3–18.6) 33 1.36 (1.35–1.37) Other Indo-Iranian languages 16 (8.9) 6.9 (6.8–7.0) 12 1.29 (1.28–1.31) All other languages 39 (21.7) 33.0 (32.8–33.2) 59 0.66 (0.65–0.66) Note: 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.
↵‡ The population group “All other” includes various population groups that individually had less than 5 counts.
↵§ The official languages include French and English.
↵¶ p < 0.001.
↵** p < 0.01.
- Table 4:
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.
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