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Table 1 Mammography utilization characteristics among Canadian women aged 40+ years, 1994–95 and 1996–97 NPHS longitudinal cohort (n = 3535)*

From: Inconsistent self-reported mammography history: Findings from the National Population Health Survey longitudinal cohort

Characteristic Frequency Percent (95% CI)
Consistent Responders 3325 94.5 (93.5–95.6)
Ever had mammogram (1994–95) and (1996–97) 2097 63.3 (61.0–65.6)
Never had mammogram (1994–95) and (1996–97) 987 24.3 (22.4–26.3)
Never had mammogram (1994–95), Ever had (1996–97) 241 6.9 (5.7–8.1)
Inconsistent Responders 210 5.5 (4.4–6.5)
Never had mammogram (1994–95), Ever had (1996–97)§ 52 1.5 (1.0–2.0)
Ever had mammogram (1994–95), Never had (1996–97) 158 4.0 (3.1–4.9)
   Time since last mammogram reported in 1994–95   
   < 6 months 32 20.3 (9.9–30.7)
   ≥ 6 months and < 2 years 55 44.1 (33.1–55.0)
   ≥ 2 years 71 35.6 (25.6–45.6)
   Reason for mammogram: check up / no particular problem 132 85.6 (78.2–93.1)
  1. * n = 2 respondents not classified as consistent or inconsistent as they reported initiation of mammography use in 1996–97 but did not report time of most recent mammogram
  2. † weighted according to 1994–95 population characteristics
  3. ‡ reported time of mammogram consistent with interval between surveys
  4. §reported time of mammogram inconsistent with interval between surveys