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Table 2 Results of ordinal regression analysis with a) survey design and b) survey mode as predictor

From: Comparison of response patterns in different survey designs: a longitudinal panel with mixed-mode and online-only design

No. Item Adjusteda OR (95% CI) mixed-mode compared to online-only p valueb (local significance level of FDR) Adjusteda OR (95% CI) paper mode compared to online mode (within mixed-mode) p valueb (local significance level of FDR)
12c K: Relaxation exercises protect against ARI 2.12 (1.71–2.63) 10−11 (0.0004) 2.65 (1.96–3.58) 10−10 (0.0004)
25c K: Avoidance of being cold protects against ARI 1.96 (1.58–2.44) 10−9 (0.001) 1.55 (1.16–2.07) 0.003 (0.004)
1d FREQ: 12-month prevalence of infection of the upper respiratory tract 1.54 (1.26–1.88) 10−5 (0.001) 1.46 (1.11–1.9) 0.01 (0.005)
14d K: Vitamin C protects against ARI 0.57 (0.46–0.7) 10−7 (0.01) 1.07 (0.82–1.41) 0.61 (0.039)
24d K: Probiotic yogurt protects against ARI 1.41 (1.14–1.73) 0.001 (0.003) 1.13 (0.85–1.49) 0.41 (0.029)
26d K: Cold and hot contrast showers protect against ARI 1.36 (1.11–1.67) 0.003 (0.004) 1.31 (0.99–1.72) 0.06 (0.009)
30d P: Implementation of regular ventilation of living rooms 0.65 (0.52–0.82) 10−4 (0.002) 0.88 (0.65–1.18) 0.39 (0.028)
68d A: Vaccinations are effective in preventing infectious diseases 0.66 (0.52–0.83) 0.001 (0.003) 0.65 (0.48–0.88) 0.01 (0.005)
69d A: Vaccinations are getting safer and more effective 0.62 (0.5–0.78) 10−5 (0.002) 0.78 (0.58–1.06) 0.12 (0.015)
89d K: Avoidance of woods protects against tick bites 1.37 (1.12–1.69) 0.003 (0.004) 1.21 (0.91–1.6) 0.18 (0.02)
108d P: Implementation of anti-tick treatment 0.71 (0.57–0.88) 0.002 (0.003) 0.76 (0.57–1.02) 0.07 (0.01)
7e FREQ: 12-month prevalence of diarrhoea 1.03 (0.84–1.27) 0.77 (0.045) 1.61 (1.23–2.13) 10−4 (0.002)
32e P: Implementation of using saunas 1.04 (0.83–1.3) 0.71 (0.043) 0.46 (0.34–0.62) 10−7 (0.001)
36e P: Implementation of taking homeopathic substances 0.73 (0.59–0.92) 0.01 (0.006) 0.5 (0.36–0.69) 10−5 (0.001)
38e P: Implementation of drinking much water 0.89 (0.71–1.1) 0.28 (0.03) 0.6 (0.44–0.82) 0.001 (0.003)
40e P: Implementation of outside activities 0.84 (0.68–1.04) 0.10 (0.018) 0.62 (0.46–0.82) 0.001 (0.002)
63e K: Vaccination recommendation influenza 0.72 (0.54–0.96) 0.02 (0.01) 0.55 (0.36–0.82) 0.003 (0.004)
88e A: Worry to get infected with Tick-borne encephalitis 1.11 (0.9–1.37) 0.32 (0.032) 1.61 (1.21–2.15) 0.001 (0.003)
103e P: Implementation of avoidance of woods 1.22 (0.96–1.56) 0.11 (0.019) 1.87 (1.35–2.61) 10−4 (0.001)
107e P: Implementation of wearing trousers in socks 0.78 (0.63–0.96) 0.02 (0.009) 0.63 (0.47–0.85) 0.002 (0.003)
  1. Each item analysed as outcome in one ordinal regression analysis
  2. Number of item: compare Additional file 1. A Question about attitudes, ARI acute respiratory infection, FDR false discovery rate, FREQ Question about frequency of infections, K Question about knowledge, P Question about practice
  3. aAdjusted for age at baseline (fitted as fractional polynomial), sex, and highest completed education
  4. bWald test with the null hypothesis that the respective OR is equal to one
  5. cOR is significantly different from one in both the comparison mixed-mode versus online-only and the comparison paper mode versus online mode
  6. dOR is significantly different from one in the comparison mixed-mode versus online-only
  7. eOR is significantly different from one in the comparison paper mode versus online mode