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Table 4 Effect of geographical distance on recruiter-recruita relationship

From: Tracking social contact networks with online respondent-driven detection: who recruits whom?

Variable correlation/odds ratio Same postal codeb p value 1 to 10 kmb p value >10 kmb p value Overall test
Age r 0.50 [0.39–0.61] <0.001 (df: 177) 0.40 [0.25–0.53] <0.001 (df: 144) 0.21 [0.06–0.35] 0.008 (df: 160) 0.008
Education r rank 0.33 [0.19–0.47] <0.001 (n: 179) 0.26 [0.09–0.41] 0.001 (n: 146) 0.32 [0.15–0.47] <0.001 (n: 162) 0.770
Household size r 0.40 [0.26–0.51] <0.001 (df: 177) 0.08 [−0.09–0.24] 0.363 (df: 144) 0.14 [−0.01–0.29] 0.067 (df: 160) 0.004
Degree LOG r 0.16 [0.01–0.30] 0.034 (df: 173) −0.02 [−0.18–0.15] 0.855 (df: 136) 0.04 [−0.11–0.20] 0.583 (df: 154) 0.264
Belief vaccination protects r rank 0.19 [0.04–0.35] 0.012 (n: 169) 0.17 [−0.00–0.33] 0.056 (n: 131) 0.41 [0.27–0.55] <0.001 (n: 154) 0.041
Sex OR 0.35 [0.14–0.79] 0.006 (n: 179) 4.86 [2.13–11.39] <0.001 (n: 146) 1.91 [0.93–3.93] 0.054 (n: 162) <0.001
Vaccinated OR 4.94 [2.30–11.07] <0.001 (n: 169) 3.54 [1.50–8.67] 0.001 (n: 131) 1.36 [0.66–2.81] 0.366 (n: 154) 0.025
One or more symptoms OR 1.09 [0.57–2.11] 0.771 (n: 169) 3.03 [1.39–6.80] 0.002 (n: 131) 1.36 [0.68–2.72] 0.349 (n: 154) 0.093
Self-reported common cold OR 1.27 [0.47–3.23] 0.585 (n: 169) 1.31 [0.33–4.35] 0.635 (n: 131) 1.10 [0.25–3.79] 0.874 (n: 154) 0.974
Self-reported influenza OR 8.01 [1.98–31.38] <0.001 (n: 169) 9.32 [1.22–59.64] 0.001 (n: 131) 4.90 [0.73–25.05] 0.052c (n: 154) 0.814
  1. aNumber of pairs with same postal code (n: 180 pairs), with same Internet Protocol (IP) address (n: 86), and number of pairs with both same postal code and same IP address (n: 72)
  2. bCorrelation coefficients/odds ratios with 95 % confidence intervals are shown
  3. cFisher’s exact test was used for contingency tables containing small values (n < 10)