From: A randomized trial of mailed questionnaires versus telephone interviews: Response patterns in a survey
Mailed questionnaire
Telephone interview
%
N
Total
58.1
2611
56.2*
1389
Gender
Men
54.2
1319
57.9
681
Women
62.0
1292
54.7
708
Age
20 – 30
56.6
698
56.3
352
31 – 40
62.8
653
51.6
347
41 – 50
59.0
649
61.8
351
51 – 60
53.7
611
55.2
339