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Table 6 Increased health symptom frequency for mail and Web survey respondents

From: Self-reported data in environmental health studies: mail vs. web-based surveys

Health Symptoms% Mail a% Web aCrude OR [95%CI] b,cAdj. OR [95%CI] c,d
Nose irritation22.019.61.20 [0.85–1.69]1.28 [0.89–1.85]
Blocked nose25.824.01.15 [0.83–1.58]1.39 [0.98–1.96]*
Runny nose32.133.11.00 [0.75–1.34]1.17 [0.85–1.60]
Chest wheezing9.49.11.07 [0.66–1.72]1.19 [0.71–2.01]
Breathing problems7.55.11.55 [0.85–2.83]1.56 [0.81–2.99]
Eyes irritation31.223.61.53 [1.12–2.11]**1.46 [1.04–2.05]**
Cough27.920.41.58 [1.14–2.21]**1.68 [1.17–2.40]**
Throat Irritation18.817.51.14 [0.80–1.63]1.40 [0.95–2.06]*
Hoarseness9.25.81.70 [0.97–2.98]*2.00 [1.09–3.69]**
Bodily pain34.930.21.30 [0.97–1.75]*1.36 [0.98–1.87]*
  1. a Indicates the percentage of mail and Web survey respondents that have reported “increased frequency” occurrence of each health symptom
  2. b Indicates the odds that mail survey respondents reported increased symptom frequency in comparison to Web survey respondents
  3. c *p < 0.1; **p < 0.05
  4. d Indicates the odds that mail survey respondents reported increased symptom frequency in comparison to Web survey respondents, after controlling for age, sex, education, region where the individual lives (i.e. Anholt, Lindet, Keldsnor and Sundeved), smoking status, childhood living environment, presence of children at home, period spent outside home and job situation