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. 2021 Feb 21;36(7):1981–1988. doi: 10.1093/humrep/deab036

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.