Table I.
Characteristics of the study population, Ontario, Canada 1992-2011
Characteristic | Survivors | Unexposed | Standardized | |
---|---|---|---|---|
N = 14,316 | N = 60,975 | Difference | ||
Age at diagnosis* | Mean ± SD | 31.4 ± 6.3 | 31.2 ± 6.4 | 0.04 |
Median (IQR) | 33 (27–37) | 33 (27–37) | 0.04 | |
Age group | 15–29 | 4,728 (33.0%) | 21,327 (35.0%) | 0.04 |
30–39 | 9,588 (67.0%) | 39,648 (65.0%) | 0.04 | |
Parity | Nulliparous | 8,290 (57.9%) | 36,164 (59.3%) | 0.03 |
Parous | 6,026 (42.1%) | 24,811 (40.7%) | 0.03 | |
Income quintile | 1 | 2,542 (17.8%) | 12,267 (20.1%) | 0.06 |
2 | 2,760 (19.3%) | 12,298 (20.2%) | 0.02 | |
3 | 2,928 (20.5%) | 12,178 (20.0%) | 0.01 | |
4 | 3,186 (22.3%) | 12,466 (20.4%) | 0.04 | |
5 | 2,856 (19.9%) | 11,481 (18.8%) | 0.03 | |
Missing | 44 (0.3%) | 285 (0.5%) | 0.03 | |
Obesity at baseline | No | 13,734 (95.9%) | 58,507 (96.0%) | 0 |
Yes | 582 (4.1%) | 2,468 (4.0%) | 0 | |
Immigration status | Immigrant | 2,521 (17.6%) | 11,547 (18.9%) | 0.03 |
Non-immigrant | 11,795 (82.4%) | 49,428 (81.1%) | 0.03 | |
Type of malignancy* | Brain | 574 (4.0%) | 2,517 (4.1%) | 0.01 |
Breast | 3,782 (26.4%) | 15,755 (25.8%) | 0.01 | |
Colorectal | 361 (2.5%) | 1,510 (2.5%) | 0 | |
Leukemia | 292 (2.0%) | 1,281 (2.1%) | 0 | |
Hodgkin lymphoma | 1,240 (8.7%) | 5,516 (9.0%) | 0.01 | |
Non-Hodgkin Lymphoma | 742 (5.2%) | 3,208 (5.3%) | 0 | |
Thyroid | 5,144 (35.9%) | 21,846 (35.8%) | 0 | |
Melanoma | 2,181 (15.2%) | 9,342 (15.3%) | 0 |
Values shown in the unexposed column correspond to number (%) of matched controls as evidence of the adequacy of the matching process.