Table 2
 Recruitment survey rates: Wave 1
Canada
USA
UK
Australia
Number recruited
2507
2500
2730
2566
Cooperation rate
82.3%
83.2%
78.7%
78.8%
Response Rate AAPOR#4
49.5%
25.6%
37.8%
45.8%
Survey length (min)
11.8
13.2
10.3
9.1