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.