Table 1 Baseline comparison of influencing factors before and after PSM

Gender-Female (%)

237(56.8)

260(51.2)

0.09

0.11

163(52.4)

168(54.0)

0.75

0.03

Age

67.06 ± 7.28

65.76 ± 6.26

0.004*

0.19

66.08 ± 6.91

66.05 ± 6.21

0.95

0.005

Occupation(%)

< 0.001*

0.68

0.94

0.07

Clerk

19(4.6)

67(13.2)

19(6.1)

16(5.1)

Craftsman

255(61.2)

308(60.6)

225(72.3)

233(74.9)

Farmers or unemployed

107(25.7)

33(6.5)

33(10.6)

30(9.6)

Technical personnel

29(7.0)

66(13.0)

27(8.7)

24(7.7)

Other occupations

7(1.7)

34(6.7)

7(2.3)

8(2.6)

Marriage - having a spouse (%)

368(88.2)

465(91.5)

0.12

0.11

281(90.4)

283(91.0)

0.89

0.02

Living mode (%)

0.74

0.05

0.92

0.03

Live alone

20(4.8)

23(4.5)

14(4.5)

14(4.5)

Live with spouse

230(55.2)

293(57.7)

171(55.0)

176(56.6)

Live with posterity

167(40.0)

192(37.8)

126(40.5)

121(38.9)

APOE genotype

χ²

P

χ²

P

5.63

0.34

5.84

0.32

ε2/2

4(1.0)

6(1.3)

4(1.4)

5(1.7)

ε2/3

54(13.9)

54(11.6)

42(14.6)

36(12.4)

ε2/4

5(1.3)

6(1.3)

2(0.7)

4(1.4)

ε3/3

265(68.5)

321(68.7)

197(68.4)

193(66.6)

ε3/4

56(14.5)

80(17.1)

40(13.9)

52(17.9)

ε4/4

3(0.8)

0(0.0)

3(1.0)

0(0.0)

APOE allele

0.62

0.73

0.65

0.72

ε2

67(8.7)

72(7.7)

52(9.0)

50(8.6)

ε3

640(82.7)

776(83.1)

476(82.6)

474(81.7)

ε4

67(8.7)

86(9.2)

48(8.3)

56(9.7)