Geographical Differences in Male Infertility between the United States and Canada: Insights from the Andrology Research Consortium

Table 1

Patient demographics of men presenting for infertility investigation stratified by Canada and the US.

Covariate	Full sample ()	Canada ()	US ()	value
Race				<0.001
American Indian or Alaska Native	67 (1%)	65 (1%)	2 (0%)
Asian	1302 (20%)	1210 (21%)	92 (13%)
Black or African American	392 (6%)	347 (6%)	45 (7%)
Native Hawaiian or other Pacific Islander	8 (0%)	1 (0%)	7 (1%)
White	3320 (51%)	2812 (49%)	508 (74%)
Other race	1373 (21%)	1343 (23%)	30 (4%)
Patient age (years)				<0.001
Mean (SD)	36.6 (7.5%)	36.4 (7.5%)	37.5 (7.4%)
Missing	1541	1528	13
Age group (years)
<20	38 (1%)	34 (1%)	4 (1%)	<0.001
20-25	135 (3%)	122 (3%)	13 (2%)
26-30	730 (15%)	669 (16%)	61 (9%)
31-35	1565 (32%)	1351 (32%)	214 (32%)
36-40	1224 (25%)	1027 (24%)	197 (29%)
41-45	690 (14%)	585 (14%)	105 (16%)
46-50	307 (6%)	263 (6%)	44 (7%)
51-55	137 (3%)	118 (3%)	19 (3%)
56-60	57 (1%)	51 (1%)	6 (1%)
60+	38 (1%)	30 (1%)	8 (1%)
Missing	1541	1528	13
Partner age (years)
Mean (SD)	33.1 (5)	32.8 (5)	34.5 (5.1)	<0.001
Median (range)	33 (18-63)	33 (18-63)	34 (18-55)
Missing	2056	2025	31
Ethnicity
Latino/Hispanic	170 (3%)	142 (3%)	28 (13%)	<0.001
Non-Latino/Hispanic	5527 (97%)	5332 (97%)	195 (87%)
Missing	765	304	461
Body mass index
Mean (SD)	28.4 (6)	27.9 (5.4)	33.3 (8)	<0.001
Median (range)	27.2 (13.3-64.4)	26.9 (13.3-61.6)	32.2 (15.9-64.4)
Underweight (<18.5)	46 (1%)	43 (1%)	3 (0)	<0.001
Normal (18.5-24.9)	1688 (27%)	1617 (29%)	71 (12%)
Overweight (25.0-29.9)	2621 (42%)	2472 (44%)	149 (25%)
Obese (30+)	1837 (30%)	1455 (26%)	382 (63%)
Missing	270	191	79

Bold values represent statistically significant -values.