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Table 2 Comparison of response rates by invitation mode and survey type

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 postal
Overall 1328 30.2 649 34.8 679 25.8 < 0.001
Length & type
 Short, closed 316 27.9 154 28.6 162 27.2 0.78
 Short, open 330 31.2 162 36.4 168 26.2 0.05
 Long, closed 334 31.4 154 35.1 180 28.3 0.19
 Long, open 348 30.2 179 38.6 169 21.3 < 0.001
  1. aAAPOR response rate2 (number completed + number partial completes/sample size)