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Table 3 Comparison of seed and recruit sample sizes (and proportions for recruits), homophily and estimated population proportions between arms 1 and 2

From: Understanding recruitment: outcomes associated with alternate methods for seed selection in respondent driven sampling

  Arm 1    Arm 2   
Variable Seeds Recruits (observed proportion) Estimated population proportion (CI) Homophily Seeds Recruits (observed proportion) Estimated population proportion (CI) Homophily
Education         
Graduate or in school 6 84 (0.43) 0.39 (0.32-0.45) 0.086 29 96 (0.36) 0.32 (0.26-0.37) 0.144
Dropped out or unsure 17 111 (0.57) 0.61 (0.55-0.68) -0.061 89 168 (0.64) 0.69 (0.63-0.74) -0.037
Income         
Full/part-time work 5 36 (0.19) 0.17 (0.12-0.23) 0.093 8 39 (0.15) 0.15 (0.10-0.20) 0.026
Support 18 159 (0.82) 0.83 (0.77-0.88) 0.021 110 225 (0.85) 0.85 (0.80-0.90) 0.037
Housing         
Private residence 11 106 (0.54) 0.52 (0.44-0.6) 0.326 54 160 (0.61) 0.64 (0.55-0.72) 0.482
Public residence 12 89 (0.46) 0.48 (0.4-0.56) 0.205 64 104 (0.40) 0.37 (0.29-0.45) 0.345
Gender         
Male 12 109(0.56) 0.61 (0.54-0.67) -0.011 53 143 (0.54) 0.55 (0.48-0.63) 0.104
Female 8 82(0.42) 0.38 (0.31-0.45) 0.153 64 119 (0.46) 0.45 (0.37-0.52) 0.11
Transgender 3 4 (0.02) 0.02 (0.004-0.03) -1.0 1 2 (0.01) 0.004 (0.002-0.01) -1.0
Ethnicity         
Caucasian 5 62 (0.32) 0.32 (0.24-0.39) 0.113 10 57 (0.22) 0.28 (0.21-0.35) 0.096
Aboriginal 13 79 (0.41) 0.42 (0.32-0.51) 0.302 80 150 (0.57) 0.46 (0.38-0.55) 0.409
Metis 2 42(0.22) 0.19 (0.14-0.24) 0.102 24 47 (0.18) 0.20 (0.15-0.27) 0.013
Other and unsure 3 12(0.06) 0.074 (0.03-0.13) 0.1 4 10 (0.04) 0.06 (0.03-0.09) -1.0
Solvent use         
No 11 135 (0.70) 0.70 (0.64-0.75) -0.024 64 147 (0.56) 0.58 (0.5-0.65) 0.238
Yes 12 60(0.31) 0.30 (0.25-0.36) -0.083 54 117 (0.44) 0.43 (0.35-0.50) 0.224
IDU         
No 8 100 (0.51) 0.56 (0.47-0.64) 0.28 53 136 (0.52) 0.50 (0.42-0.56) 0.187
Yes 15 95 (0.49) 0.44 (0.35-0.53) 0.345 65 128 (0.49) 0.5 (0.44-0.58) 0.072
Street-involved youth         
No 18 161 (0.83) 0.84 (0.79-0.89) 0.129 99 246 (0.93) 0.95 (0.93-0.98) -0.011
Yes 5 34(0.17) 0.16 (0.11-0.22) 0.262 19 18 (0.07) 0.05 (0.03-0.07) 0.141
MSM         
No 19 178(0.91) 0.90 (0.86-0.94) 0.072 115 254 (0.96) 0.97 (0.95-0.99) -0.008
Yes 4 17 (0.09) 0.10 (0.06-0.14) -0.351 3 10 (0.04) 0.03 (0.01-0.05) -1.0
Sex work         
No 14 181(0.93) 0.94 (0.92-0.97) -0.019 97 228 (0.86) 0.87 (0.83-0.91) 0.068
Yes 9 14 (0.07) 0.06 (0.03-0.09) -0.202 21 36 (0.14) 0.13 (0.09-0.18) 0.103
  1. For homophily, values exceeding 0.3 or -0.3 are in bold.