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. 2020 Feb 6;9(1):e13355. doi: 10.2196/13355

Table 2.

Estimation results with probit and bivariate analysis.

Variables	Dichotomous choice		Dichotomous choice followed by an open-ended question					Multiple-bounded discrete choice
	Probit (R²=0.2375; N=199)		Probit (R²=0.0863; N=230)		Bivariate (R²=0.0633; N=230)			Probit (R²=0.2807; N=1245)
	Coefficient	T test (187)	Coefficient	T test (218)	Coefficient	T test (218)	Coefficient		T test (1233)
Bid	−0.000337^a	−4.71^b	−0.000111	−1.67^c	—^d	—	−0.000573		−17.17^b
Age (years)	−0.0264	−1.54	−0.0171	−1.15	−11.50	−0.52	−0.0279		−4.43^b
Annual income	0.00000310	0.69	0.00000509	1.00	0.00749	0.97	0.00000395		1.77 ^c
University	0.788	3.34 ^b	0.423	2.08 ^e	523.9	1.69 ^c	0.343		3.61 ^b
Very good health	0.597	2.42 ^e	−0.0571	−0.24	−110.2	−0.31	0.0157		0.15
Infertility problem	−0.165	−0.43	−0.113	−1.07	−170.3	−1.08	−0.202		−1.36
Ovulation failure	0.728	1.03	0.0395	0.29	−34.94	−0.17	0.384		1.39
Current smoker	0.401	1.49	−0.388	−1.62	−602.2	−1.72^c	0.422		4.53 ^b
Stressful job	0.200	1.81 ^c	−0.0770	−0.30	83.55	0.21	−0.0546		−0.49
Having a child is important	0.470	2.1 ^e	0.312	1.63	209.1	0.73	0.554		6.40 ^b
Employee	0.421	1.63	0.242	0.99	207.8	0.58	0.185		1.88 ^c
Constant	0.149	0.25	0.280	0.48	2218.5	2.60 ^b	0.458		1.74 ^c
Sigma	—	—	—	—	1583.9	13.34 ^b	—		—

^aItalics indicate that the term is statistically significant.

^bP<.01.

^cP<.1.

^dNot applicable.

^eP<.05.