Table 1 Baseline characteristics of participants in CHARLS by study samples and dementia.

From: Adiposity and dementia among Chinese adults: longitudinal study in the China Health and Retirement Longitudinal Study (CHARLS)

 

Total population sample

Case-control samplea

 

No dementia

Dementia

No dementia

Dementia

Middle-aged groupb N

8926

296

510

127

Follow-up, mean (SD)

5.8 (1.7)

5.7 (1.8)

5.6 (1.8)

5.6 (1.8)

BMI, mean (SD)

23.7 (3.5)

24.4 (3.6)

23.6 (3.6)

24.7 (3.5)

Waist circumference, mean (SD)

85.9 (9.9)

88.1 (10.1)

86.2 (10.2)

89.2 (10.3)

Waist-to-height ratio, mean (SD)

0.54 (0.06)

0.56 (0.07)

0.54 (0.06)

0.57 (0.07)

Sex, N (%) female

4565 (51.1)

155 (52.4)

261 (51.2)

65 (51.2)

Age, mean (SD)

57.5 (4.2)

58.6 (4.1)

62.6 (1.4)

62.5 (1.4)

Education, N (%)

 Low education level

1696 (19.0)

58 (19.6)

108 (21.2)

27 (21.3)

 Middle education level

3953 (44.3)

135 (45.6)

276 (54.1)

68 (53.5)

 High education level

3277 (36.7)

103 (34.8)

126 (24.7)

32 (25.2)

 Smoking frequencyc, mean (SD)

4.5 (9.6)

3.4 (8.8)

3.4 (8.6)

3.0 (7.9)

Drinking frequency, N (%)

 None

6029 (67.5)

229 (77.4)

369 (72.4)

102 (80.3)

 Less than once per day

1699 (19.0)

34 (11.5)

79 (15.5)

13 (10.2)

 Once per day

640 (7.2)

12 (4.1)

23 (4.5)

3 (2.4)

 Twice per day

428 (4.8)

12 (4.1)

27 (5.3)

5 (3.9)

 More than twice per day

130 (1.5)

9 (3.0)

12 (2.4)

4 (3.2)

Older-aged groupb, N

3806

327

1306

327

 Follow-up, mean (SD)

5.3 (1.8)

5.2 (1.9)

5.2 (1.9)

5.2 (1.9)

 BMI, mean (SD)

22.7 (3.7)

22.4 (3.6)

22.6 (3.7)

22.4 (3.6)

 Waist circumference, mean (SD)

85.5 (10.3)

85.4 (10.2)

85.4 (10.6)

85.4 (10.2)

 Waist-to-height ratio, mean (SD)

0.55 (0.07)

0.55 (0.07)

0.55 (0.07)

0.55 (0.07)

 Sex, N (%) female

1876 (49.3)

173 (52.9)

691 (52.9)

173 (52.9)

 Age, mean (SD)

71.8 (5.4)

73.3 (6.0)

73.1 (5.7)

73.3 (6.0)

Education, N (%)

 Low education level

1090 (28.6)

72 (22.0)

288 (22.1)

72 (22.0)

 Middle education level

1915 (50.3)

179 (54.7)

712 (54.5)

179 (54.7)

 High education level

801 (21.1)

76 (23.2)

306 (23.4)

76 (23.2)

 Smoking frequencyc, mean (SD)

3.0 (7.8)

2.0 (6.2)

2.6 (7.5)

2.0 (6.2)

Drinking frequency, N (%)

 None

2834 (74.5)

249 (76.2)

1004 (76.9)

249 (76.1)

 Less than once per day

526 (13.8)

43 (13.2)

166 (12.7)

43 (13.1)

 Once per day

239 (6.3)

17 (5.2)

74 (5.7)

17 (5.2)

 Twice per day

141 (3.7)

9 (2.8)

44 (3.4)

9 (2.8)

 More than twice per day

66 (1.7)

9 (2.8)

18 (1.4)

9 (2.8)

  1. CHARLS China health and retirement longitudinal study, BMI body mass index.
  2. aBaseline age, sex, education, year of inclusion and follow-up duration were matched. Participants aged <60 years were excluded because follow-up was short.
  3. bMiddle-aged group: adiposity measured at 50–64 years for total population and 60–64 years for participants case-control design. Older-aged group: adiposity measured at ≥65 years for total population and participants case-control design.
  4. cSmoking frequency, cigarettes/day.
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