Table 1 General characteristics of age difference between husband and wife at baseline (2006)

<.0001***

  ≤ −3

62

2.15

2.17

0.79

0.99

1.29

  −2 ~ −1

145

5.03

5.10

0.25

0.27

0.57

  0

251

8.71

8.88

0.22

0.22

0.60

  +1 ~ +2

623

21.62

21.05

0.20

0.18

0.63

  +3 ~ +4

748

25.96

26.16

0.25

0.24

0.67

  +5 ~ +6

533

18.50

18.52

0.20

0.19

0.60

  ≥ +7

519

18.01

18.12

0.32

0.32

0.77

Age

0.057

  ≤55

898

31.17

33.84

0.16

0.19

0.53

  56-65

957

33.22

36.18

0.22

0.23

0.63

  66-75

785

27.25

23.86

0.32

0.29

0.76

  ≥75

241

8.37

6.12

0.50

0.51

0.98

Education

0.188

  ≤ Middle school

1,522

52.83

50.99

0.34

0.33

0.83

  High school

886

30.75

32.22

0.17

0.18

0.45

  ≥ College

473

16.42

16.78

0.12

0.14

0.44

Income

0.104

  Yes

836

29.02

31.20

0.19

0.22

0.64

  No

2,045

70.98

68.80

0.28

0.26

0.70

Number of familiarity

0.029*

  Every day

958

33.25

31.66

0.22

0.21

0.60

  Sometimes

1,675

58.14

59.27

0.24

0.23

0.71

  Never

248

8.61

9.07

0.48

0.46

0.77

Smoking status

0.024*

  Never

1,127

39.12

38.88

0.23

0.21

0.67

  Former smoker

703

24.40

23.56

0.31

0.34

0.79

  Smoker

1,051

36.48

37.56

0.24

0.24

0.62

Alcohol use

0.103

  No

696

24.16

23.01

0.24

0.22

0.69

  Former user

386

13.40

12.63

0.42

0.42

0.98

  Yes

1,799

62.44

64.36

0.22

0.23

0.60

Economic activity

0.127

  Yes

1,703

59.11

62.47

0.18

0.19

0.60

  No

1,178

40.89

37.53

0.36

0.34

0.78

Self-rated health

<.0001***

  Good

1,470

51.02

53.24

0.11

0.12

0.45

  Normal

880

30.54

29.19

0.29

0.30

0.68

  Bad

531

18.43

17.58

0.57

0.54

1.02

Depression of partner

<.0001***

  Yes

792

27.49

26.42

0.64

0.67

0.99

  No

2,089

72.51

73.58

0.10

0.10

0.44

Marital satisfaction

0.630

  Low

83

2.88

2.79

0.49

0.52

0.57

  Middle

1,341

46.55

46.96

0.29

0.28

0.76

  High

1,457

50.57

50.25

0.20

0.21

0.60

  Total

2,881

100.00

100.00

0.25

0.25

0.68