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

Cheng, Ji; Pullenayegum, Eleanor; Marshall, Deborah A; Marshall, John K; Thabane, Lehana

doi:10.1186/1471-2288-12-15

Table 4 Estimates of coefficients of patient choice between Test A and Test B (Two-point outcome from stage-one)

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	0.27 (0.16, 0.37)	0.27 (0.19, 0.35)	0.27 (0.16, 0.37)	0.27 (0.16, 0.37)	0.16 (0.10, 0.23)	0.16 (0.12, 0.21)	0.16 (0.10, 0.23)	0.16 (0.10, 0.23)
Scope	-0.20(-0.31,-0.09)	-0.20(-0.27,-0.13)	-0.20(-0.31,-0.09)	-0.20(-0.31,-0.09)	-0.12(-0.19,-0.05)	-0.12(-0.17,-0.08)	-0.12(-0.19,-0.05)	-0.12(-0.19,-0.05)
CT	-0.13(-0.24,-0.03)	-0.13(-0.23,-0.04)	-0.13(-0.24,-0.03)	-0.13(-0.24,-0.03)	-0.08(-0.15,-0.02)	-0.08(-0.14,-0.02)	-0.08(-0.15,-0.02)	-0.08(-0.15,-0.02)
No Pain (ref = mild pain)	0.04(-0.03, 0.10)	0.04(-0.01, 0.08)	0.04(-0.03, 0.10)	0.04(-0.03, 0.10)	0.02(-0.01, 0.06)	0.02(-0.001, 0.05)	0.02(-0.01, 0.06)	0.02(-0.01, 0.06)
Preparation (ref = Enema/Lax)
None	0.17 (0.09, 0.25)	0.17 (0.11, 0.23)	0.17 (0.09, 0.25)	0.17 (0.09, 0.25)	0.10 (0.05, 0.16)	0.10 (0.07, 0.14)	0.10 (0.05, 0.16)	0.10 (0.05, 0.16)
Special Diet	-0.17(-0.26,-0.09)	-0.17(-0.24,-0.11)	-0.17(-0.26, -0.09)	-0.17 (-0.26, -0.09)	-0.11 (-0.16, -0.05)	-0.11 (-0.14, -0.07)	-0.11 (-0.16, -0.05)	-0.11 (-0.16, -0.05)
Specificity (ref = 50%)
100%	0.14 (0.05, 0.22)	0.14 (0.06, 0.21)	0.14 (0.05, 0.22)	0.14 (0.05, 0.22)	0.09 (0.03, 0.14)	0.09 (0.04, 0.13)	0.09 (0.03, 0.14)	0.09 (0.03, 0.14)
80%	-0.26 (-0.35, -0.18)	-0.26 (-0.33, -0.20)	-0.26 (-0.35, -0.18)	-0.26 (-0.35, -0.18)	-0.17 (-0.22, -0.11)	-0.17 (-0.21, -0.12)	-0.17 (-0.22, -0.11)	-0.17 (-0.22, -0.11)
Sensitivity (ref = 40%)
90%	-0.07 (-0.15, 0.01)	-0.07 (-0.14, 0.01)	-0.07 (-0.15, 0.01)	-0.07 (-0.15, 0.01)	-0.04 (-0.09, 0.01)	-0.04 (-0.08, 0.01)	-0.04 (-0.09, 0.01)	-0.04 (-0.09, 0.01)
70%	0.24 (0.15, 0.33)	0.24 (0.15, 0.33)	0.24 (0.15, 0.33)	0.24 (0.15, 0.33)	0.15 (0.03, 0.14)	0.15 (0.10, 0.20)	0.15 (0.03, 0.14)	0.15 (0.03, 0.14)
Cost (ref = $10)
$50	0.63 (0.47, 0.79)	0.63 (0.0.52, 0.74)	0.63 (0.47, 0.79)	0.63 (0.47, 0.79)	0.39 (0.29, 0.49)	0.39 (0.32, 0.46)	0.39 (0.29, 0.49)	0.39 (0.29, 0.49)
$250	0.17 (0.01, 0.33)	0.17 (0.07, 0.28)	0.17 (0.01, 0.33)	0.17 (0.01, 0.33)	0.10 (0.01, 0.20)	0.10 (0.04, 0.17)	0.10 (0.01, 0.20)	0.10 (0.01, 0.20)
$500	0.44 (0.24, 0.63)	0.44 (0.30, 0.58)	0.44 (0.24, 0.63)	0.44 (0.24, 0.63)	0.27 (0.15, 0.39)	0.27 (0.19, 0.36)	0.27 (0.15, 0.39)	0.27(0.15, 0.39)

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ISSN: 1471-2288

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