(1)

(2)

(3)

18~40岁

40~60岁

60~70岁

DF

−0.050^***

−0.045^***

−0.081^***

(−6.94)

(−17.51)

(−15.54)

Controls

Yes

Yes

Yes

Constant

0.722^***

1.138^***

−0.158

(9.87)

(12.19)

(−0.13)

N

2,682

9,099

2,754

R²

0.625

0.571

0.539