Two-stage SMM	Three-stage SMM	On-site distribution	Mail notification of web mode	Email notification of web mode	Overall
N sampled	805	804	800	804	804	4,017
N post-sampling ineligible (% of sampled by mode)	34 (4.2%)	25 (3.1%)	17 (2.1%)+	11 (1.4%)	3 (0.4%)	90 (2.2%)
N respondents	195	237	73	6	33	544
Response rate among eligible++	25.3%[ref]	30.7%***	9.6%***	0.8%***	4.3%***	14.2%