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Table 1 General characteristics of the study population (baseline 2006→2008)

From: Marital transition and cognitive function among older adults: the korean Longitudinal Study of Aging (2006–2020)

Variables

Cognitive function (MMSE score)

Male

Female

Total

< 24

≥ 24

 

Total

< 24

≥ 24

 

 N

%

N

%

N

%

P -value

N

%

N

%

N

%

P -value

Total N  = 4 364

2043

100.0

127

6.2

1916

93.8

 

2321

100.0

309

13.3

2012

86.7

 

Marital status

      

0.1372

      

< 0.0001

Married → Married

1918

93.9

115

6.0

1803

94.0

 

1886

81.3

216

11.5

1670

88.5

 

Married → Not married

13

0.6

0

0.0

13

100.0

 

25

1.1

3

12.0

22

88.0

 

Not married → Married

2

0.1

0

0.0

2

100.0

 

1

0.0

0

0.0

1

100.0

 

Not married → Not married

110

5.4

12

10.9

98

89.1

 

409

17.6

90

22.0

319

78.0

 

Age

      

< 0.0001

      

< 0.0001

45–64

1377

67.4

47

3.4

1330

96.6

 

1701

73.3

130

7.6

1571

92.4

 

≥65

666

32.6

80

12.0

586

88.0

 

620

26.7

179

28.9

441

71.1

 

Region

      

0.0012

      

< 0.0001

Urban area

902

44.2

38

4.2

864

95.8

 

1096

47.2

99

9.0

997

91.0

 

Rural area

1141

55.8

89

7.8

1052

92.2

 

1225

52.8

210

17.1

1015

82.9

 

Educational level

      

< 0.0001

      

< 0.0001

Middle school or below

861

42.1

95

11.0

766

89.0

 

1489

64.2

285

19.1

1204

80.9

 

High school or above

1182

57.9

32

2.7

1150

97.3

 

832

35.8

24

2.9

808

97.1

 

Household income

      

< 0.0001

      

< 0.0001

Quartile 1 (low)

393

19.2

55

14.0

338

86.0

 

559

24.1

134

24.0

425

76.0

 

Quartile 2

517

25.3

35

6.8

482

93.2

 

585

25.2

84

14.4

501

85.6

 

Quartile 3

570

27.9

21

3.7

549

96.3

 

585

25.2

53

9.1

532

90.9

 

Quartile 4 (high)

563

27.6

16

2.8

547

97.2

 

592

25.5

38

6.4

554

93.6

 

Living arrangement

      

< 0.0001

      

< 0.0001

Living alone

54

2.6

8

14.8

46

85.2

 

209

9.0

44

21.1

165

78.9

 

Living with a family member(s)

1989

97.4

119

6.0

1870

94.0

 

2112

91.0

265

12.5

1847

87.5

 

Number of offspring

      

< 0.0001

      

< 0.0001

None

41

2.0

5

12.2

36

87.8

 

43

1.9

5

11.6

38

88.4

 

1

146

7.1

5

3.4

141

96.6

 

161

6.9

12

7.5

149

92.5

 

2

900

44.1

35

3.9

865

96.1

 

955

41.1

66

6.9

889

93.1

 

≥3

956

46.8

82

8.6

874

91.4

 

1162

50.1

226

19.4

936

80.6

 

Chronic disease

      

0.0056

      

< 0.0001

None

1269

62.1

63

5.0

1206

95.0

 

1476

63.6

151

10.2

1325

89.8

 

1

562

27.5

42

7.5

520

92.5

 

635

27.4

112

17.6

523

82.4

 

2 or more

212

10.4

22

10.4

190

89.6

 

210

9.0

46

21.9

164

78.1

 

ADL

      

0.6462

      

0.7480

Normal

2033

99.5

126

6.2

1907

93.8

 

2311

99.6

308

13.3

2003

86.7

 

Abnormal

10

0.5

1

10.0

9

90.0

 

10

0.4

1

10.0

9

90.0

 

Grip strength

      

0.0056

      

< 0.0001

Normal

1901

93.0

98

5.2

1803

94.8

 

2124

91.5

254

12.0

1870

88.0

 

Abnormal

142

7.0

29

20.4

113

79.6

 

197

8.5

55

27.9

142

72.1

 

Satisfaction of Life

      

0.0002

      

< 0.0001

Bad

208

10.2

23

11.1

185

88.9

 

287

12.4

64

22.3

223

77.7

 

Normal

1212

59.3

76

6.3

1136

93.7

 

1388

59.8

190

13.7

1198

86.3

 

Good

623

30.5

28

4.5

595

95.5

 

646

27.8

55

8.5

591

91.5