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Table 6 Estimates of coefficients of patient choice of participation or opt-out (Two-point outcome from stage-two)

From: An empirical comparison of methods for analyzing correlated data from a discrete choice survey to elicit patient preference for colorectal cancer screening

     Two-point outcome    
   Logistic Model    Probit Model  
  Simple SE Robust SE Random-effects GEE Simple SE Robust SE Random-effects GEE
Process (ref = Enema/X-ray)         
   Stool 0.00 (-0.11, 0.11) 0.00 (-0.10, 0.09) -0.13 (-0.34, 0.08) -0.04 (-0.10, 0.03) 0.00 (-0.07, 0.07) 0.00 (-0.06, 0.06) -0.08 (-0.19, 0.04) -0.02 (-0.06, 0.02)
   Scope -0.02 (-0.14, 0.09) -0.02 (-0.13, 0.08) -0.20 (-0.42, 0.01) -0.06 (-0.13, 0.01) -0.01 (-0.08, 0.06) -0.01 (-0.08, 0.05) -0.10 (-0.22, 0.02) -0.04 (-0.08, 0.01)
   CT 0.08 (-0.03, 0.20) 0.08 (-0.03, 0.20) 0.62 (0.40, 0.85) 0.18 (0.11, 0.25) 0.05 (-0.02, 0.12) 0.05 (-0.02, 0.12) 0.35 (0.22, 0.47) 0.11 (0.07, 0.15)
No Pain (ref = mild pain) 0.01 (-0.05, 0.08) 0.01 (-0.04, 0.07) 0.04 (-0.09, 0.16) 0.01 (-0.03, 0.05) 0.01 (-0.03, 0.05) 0.01 (-0.02, 0.04) 0.02 (-0.05, 0.09) 0.01 (-0.02, 0.03)
Preparation (ref = Enema/Lax)         
   None 0.15 (0.06, 0.24) 0.15 (0.07, 0.22) 0.25 (0.09, 0.42) 0.08 (0.03, 0.14) 0.09 (0.03, 0.14) 0.09 (0.04, 0.13) 0.14 (0.04, 0.23) 0.05 (0.02, 0.08)
   Special Diet -0.03 (-0.13, 0.06) -0.03 (-0.13, 0.07) -0.01 (-0.20, 0.17) -0.01 (-0.07, 0.05) -0.02 (-0.08, 0.04) -0.02 (-0.07, 0.04) -0.01 (-0.11, 0.09) -0.01 (-0.04, 0.03)
Specificity (ref = 50%)         
   100% 0.01 (-0.08, 0.10) 0.01 (-0.07, 0.09) 0.34 (0.17, 0.51) 0.10 (0.04, 0.15) 0..01 (-0.05, 0.07) 0.01 (-0.04, 0.06) 0.19 (0.09, 0.29) 0.01 (0.02, 0.09)
   80% 0.04 (-0.05, 0.13) 0.04 (-0.03, 0.11) 0.08 (-0.09, 0.25) 0.02 (-0.03, 0.08) 0.02 (-0.03, 0.08) 0.03 (-0.02, 0.07) 0.05 (-0.05, 0.14) 0.01 (-0.02, 0.05)
Sensitivity (ref = 40%)         
   90% 0.21 (0.12, 0.30) 0.21 (0.13, 0.29) 0.71 (0.53, 0.89) 0.21 (0.16, 0.27) 0.13 (0.07, 0.18) 0.13 (0.08, 0.18) 0.40 (0.31, 0.50) 0.13 (0.10, 0.16)
   70% 0.01 (-0.08, 0.11) 0.01 (-0.07, 0.09) 0.04 (-0.14, 0.22) 0.01 (-0.04, 0.07) 0.01 (-0.05, 0.07) 0.01 (-0.04, 0.06) 0.03 (-0.07, 0.13) 0.01 (-0.03, 0.04)
Cost (ref = $10)         
   $50 -0.09 (-0.26, 0.08) -0.09 (-0.21, 0.02) -0.40 (-0.71, -0.08) -0.12 (-0.24, -0.02) -0.05 (-0.16, 0.05) -0.05 (-0.12, 0.01) -0.21 (-0.39, -0.04) -0.07 (-0.13, -0.01)
   $250 -0.16 (-0.36, 0.02) -0.16 (-0.36, 0.04) -1.21 (-1.56, -0.86) -0.36 (-0.47, -0.25) -0.10 (-0.20, 0.01) -0.09 (-0.22, 0.02) -0.67 (-0.87, -0.48) -0.22 (-0.13, -0.01)
   $500 -0.54 (-0.74, -0.34) -0.54 (-0.74, -0.34) -1.69 (-2.08, -1.30) -0.53 (-0.65, -0.41) -0.33 (-0.45, -0.21) -0.33 (-0.45, -0.21) -0.95 (-1.16, -0.73) -0.32 (-0.40, -0.25)
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BMC Medical Research Methodology

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