Table 3.
Adjusted odds ratios (ORs) and 95% confidence intervals (95% CI) for the association between mammographic screening examinations and familial risk for female relatives from the Ontario Site of the Breast Cancer Family Registry
| Familial Risk [n (%)] | |||
|---|---|---|---|
| Screening Examinations | Low (N = 521) |
Moderate or High (N = 518) |
ORa (95% CI) |
| Time since last mammogramb c | |||
| All women | |||
| Never had or non-screening mammogram | 195 (39.2) | 93 (19.0) | 1.00 |
| Screening mammogram, ≤ 12 months ago | 180 (36.1) | 272 (55.5) | 1.90 (1.26-2.85) d |
| Screening mammogram, > 12 – 24 months ago | 65 (13.1) | 76 (15.5) | 1.52 (0.93-2.47) |
| Screening mammogram, > 24 months ago | 58 (11.7) | 49 (10.0) | 1.11 (0.67-1.83) |
| Women < 40 years | |||
| Never had or non-screening mammogram | 136 (82.4) | 48 (73.9) | 1.00 |
| Screening mammogram, ≤ 12 months ago | 11 (6.7) | 8 (12.3) | 1.95 (0.54-7.00) |
| Screening mammogram, > 12 – 24 months ago | 10 (6.1) | 5 (7.7) | 1.21 (0.36-4.11) |
| Screening mammogram, > 24 months ago | 8 (4.9) | 4 (6.2) | 1.23 (0.30-5.05) |
| Women 40-49 years | |||
| Never had or non-screening mammogram | 47 (31.8) | 27 (19.4) | 1.00 |
| Screening mammogram, ≤ 12 months ago | 54 (36.5) | 79 (56.8) | 2.80 (1.40-5.58) d |
| Screening mammogram, > 12 – 24 months ago | 18 (12.2) | 18 (13.0) | 1.83 (0.75-4.49) |
| Screening mammogram, > 24 months ago | 29 (19.6) | 15 (10.8) | 0.94 (0.38-2.31) |
| Women ≥ 50 years | |||
| Never had or non-screening mammogram | 12 (6.5) | 18 (6.3) | 1.00 |
| Screening mammogram, ≤ 12 months ago | 115 (62.2) | 185 (64.7) | 1.10 (0.49-2.49) |
| Screening mammogram, > 12 – 24 months ago | 37 (20.0) | 53 (18.5) | 0.98 (0.40-2.40) |
| Screening mammogram, > 24 months ago | 21 (11.4) | 30 (10.5) | 0.95 (0.37- 2.45) |
a
Odds ratio compare women at moderate or high familial risk to women at low familial risk. Models adjusted for age at interview, education and number of health profession visits
b
Excludes women who stated they had a bilateral mastectomy (N = 6)
c
Excludes women for whom the reason for mammogram could not be ascertained (N = 24)
d
p < 0.01