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Table 1 Comparison of response rates by invitation mode, age group and 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

  Total Email invitation Postal invitation p-value
Number sent Response ratea Number sent Response ratea Number sent Response ratea Email vs post
Overall 1328 30.2 649 34.8 679 25.8 < 0.001
Age groupb
 18–34 yrs 202 17.8 101 23.8 101 11.9 0.03
 35–49 yrs 504 25.4 243 34.2 261 17.2 < 0.001
 50–64 yrs 475 36.4 230 40.0 245 33.1 0.12
  ≥ 65 yrs 131 48.1 65 40.0 66 56.1 0.07
p-value (trend)   < 0.001   0.01   < 0.001  
Sexc
 Female 1063 29.9 509 36.0 554 24.4 < 0.001
 Male 263 31.6 138 31.2 125 32.0 0.88
Age and sexb,c
 Female 18–49 yrs 564 23.6 268 32.1 296 15.9 < 0.001
 Male 18–49 yrs 140 22.1 74 28.4 66 15.2 0.06
 Female ≥50 yrs 489 37.8 236 41.1 253 34.8 0.15
 Male ≥50 yrs 117 43.6 59 35.6 58 51.7 0.08
  1. vs: versus; yrs.: years
  2. aAAPOR response rate2 (number completed + number partial completes/sample size)
  3. b16 respondents had no data for age
  4. c2 respondents had no data for sex