Table 3.

Determinants of WTP and WTT^a

	OLSb		SURb
	LogWTP	WTT	LogWTP	WTT
Number of mammograms in the last 5 years? (0–5)	−0.294**	−29.581*	−0.294**	−21.162**
	(2.769)	(2.190)	(3.391)	(2.989)
Sister, mother or daughter (related by blood) had breast cancer (1 = yes, 0 = no)	0.988**	101.420**	0.988**	86.643**
	(3.932)	(3.060)	(4.815)	(5.173)
Perceived chance of survival for early detection (excellent = 1; good = 0)	−0.323	−16.866	−0.323	−106.644**
	(1.078)	(0.499)	(1.320)	(5.347)
Need mammogram after clinical breast examination (agree = 1; disagree = 0)	1.246*	9.166	1.246**	0.865
	(2.351)	(0.131)	(2.879)	(0.025)
Mammogram is best method for detecting breast cancer (agree = 1; disagree = 0)	−0.384	−44.539	−0.384	−10.023
	(1.437)	(1.307)	(1.760)	(0.563)
Income (1 = $30 000+, 0 = otherwise)	1.502**	14.490	1.502**	14.188
	(6.096)	(0.444)	(7.466)	(0.864)
Years of schooling (2–20)	0.093	4.371	0.093*	0.586
	(1.888)	(0.680)	(2.312)	(0.179)
Age	0.012	−0.248	0.012	−5.305**
	(0.465)	(0.076)	(0.569)	(3.064)
African American	0.999*	110.206	0.999**	127.824**
	(2.122)	(1.796)	(2.599)	(4.076)
Filipina	0.413	53.416	0.413	−17.589
	(0.918)	(0.953)	(1.125)	(0.587)
Latina	1.186*	142.011*	1.186**	119.272**
	(2.576)	(2.373)	(3.155)	(3.888)
Constant	2.563	115.524	2.563	478.295**
	(1.354)	(0.488)	(1.658)	(3.792)
Observations	36	40	36	36
R-squared (pseudo R-squared for SUR)	0.81	0.53	0.81	0.82
Adjusted R-squared	0.73	0.35	–	–
Model statistics (F-statistic for OLS, χ2 for SUR)c	9.52**	2.87**	157.1**	161.1**

^aAbsolute value of t-statistics in parentheses.

^bOrdinary least squares regression (OLS); Zellner’s seemingly unrelated regression (SUR).

^cThe models have 11 parameters; degrees of freedom = observations – parameters – 1.

^*Significant at 5% level (two-tailed test).

^**Significant at 1% level (two-tailed test).