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Table 3 Association between invitation mode and response rate, stratified by sex

From: Comparison of response rates on invitation mode of a web-based survey on influenza vaccine adverse events among healthcare workers: a pilot study

  Odds Ratio 95% Confidence Interval p-value
Male
Invitation mode
 Post Referent   
 Email 0.97 (0.56, 1.68) 0.90
Age groupa
 18–34 years Referent   
 35–49 years 6.87 (1.55, 30.4) 0.011
 50–64 years 10.43 (2.33, 46.7) 0.002
  ≥ 65 years 21.20 (4.50, 99.8) 0.000
Female
Invitation mode
 Post Referent   
 Email 1.77 (1.35, 2.32) < 0.001
Age groupa
 18–34 years Referent   
 35–49 years 1.29 (0.83, 2.01) 0.26
 50–64 years 2.23 (1.44, 3.43) < 0.001
  ≥ 65 years 3.19 (1.81, 5.64) < 0.001
  1. a16 respondents had no data for age