Table 2: Sex-stratified proportions (95% CIs) of the Canadian population (2011 full census data) compared with the national sample patient population in the CPCSSN
Characteristic by age groupCensus 2011 population
N = 33 476 715		CPCSSN national population
N = 392 443
No. of males,
% (95% CI)
n = 16 414 225		No. of females,
% (95% CI)
n = 17 062 490		Sex ratioNo. of males,
% (95% CI)
n = 168 316		No. of females,
% (95% CI)
n = 224 127		Sex ratio
Infants, 0-4 yr961 150,
5.85 (5.84-5.87)		915 950,
5.37 (5.36-5.38)		1.0510 492,
6.23 (6.12-6.35)		10 390,
4.64 (4.55-4.72)		1.01
Children, 5-19 yr3 025 790,
18.43 (18.41-18.45)		2 882 605,
16.89 (16.88-16.91)		1.0527 582,
16.39 (16.21-16.56)		28 886,
12.89 (12.75-13.03)		0.95
Young adults, 20-39 yr4 309 075,
26.25 (26.23-26.27)		4 384 810,
25.70 (25.68-25.72)		0.9835 434,
21.10 (20.86-21.25)		58 415,
26.06 (25.88-26.25)		0.61
Middle aged, 40-64 yr5 919 450,
36.06 (36.04-36.09)		6 132 845,
35.94 (35.92-35.97)		0.9760 236,
35.79 (35.56-36.02)		81 128,
36.20 (36.00-36.40)		0.74
Older adults, 65 yr and older2 198 760,
13.39 (13.38-13.41)		2 746 280,
16.09 (16.08-16.11)		0.8034 572,
20.54 (20.35-20.73)		45 308,
20.21 (20.05-20.38)		0.76

Note: CI = confidence interval, CPCSSN = Canadian Primary Care Sentinel Surveillance Network, sex ratio = no. of males/no. of females.