Table 1.

Descriptive statistics by group

Variable name:		Control	Gain-framed altruistic	Loss-framed altruistic	Selfish	Selfish and altruistic	Simple
	N =	704	717	697	725	684	714
Age	Mean	46.73	46.29	46.68	45.96	46.70	46.45
	S.D	[13.62]	[13.53]	[13.48]	[13.76]	[13.87]	[13.92]
Female dummy	Mean	0.49	0.50	0.50	0.50	0.52	0.49
	S.D	[0.50]	[0.50]	[0.50]	[0.50]	[0.50]	[0.50]
Educational year	Mean	14.58	14.60	14.67	14.63	14.66	14.73
	S.D	[2.09]	[2.05]	[1.97]	[2.03]	[2.06]	[2.06]
Married dummy	Mean	0.57	0.59	0.60	0.56	0.57	0.55
	S.D	[0.49]	[0.49]	[0.49]	[0.50]	[0.49]	[0.50]
Annual household income (Unit: 10 thousand yen)	Mean	606.16	622.92	611.07	631.46	627.84	628.98
	S.D	[344.90]	[378.02]	[359.44]	[373.06]	[343.79]	[376.24]
No income information dummy	Mean	0.19	0.16	0.19	0.19	0.19	0.17
	S.D	[0.39]	[0.37]	[0.39]	[0.39]	[0.39]	[0.38]

Note Some participants did not answer annual household income. We imputed the average amount of income for such respondents while considering that they did not answer it by using the variable of no income information