Association between previous cataract surgery and cognition among middle-aged and older Chinese: the China health and retirement longitudinal study (CHARLS)

Table 1 Demographic characteristics of middle-aged and elderly Chinese with and without cataract surgery

Variables	Cataract surgery	Without cataract surgery	P
Total	261	13,563
Age	69.36 ± 10.20	58.84 ± 9.99	< 0.001
Sex, n (%)			0.001
Male	99 (37.9)	6548 (48.3)
Female	162 (62.1)	7015 (51.7)
Smoking status, n (%)			0.593
Yes	162 (62.1)	5366 (39.6)
No	99 (37.9)	8197 (60.4)
Drinking status, n (%)			0.006
Drink more than once a month	45 (17.2)	3423 (25.2)
Drink but less than once a month	18 (6.9)	1084 (8.0)
None	198 (75.9)	9056 (66.8)
Hypertension, n (%)			< 0.001
Yes	107 (41.0)	3272 (24.1)
No	154 (59.0)	10,291 (75.9)
Diabetes, n (%)			< 0.001
Yes	34 (13.0)	759 (5.6)
No	227 (87.0)	12,804 (94.4)
Dyslipidemia, n (%)			0.044
Yes	33 (12.6)	1224 (9.0)
No	228 (87.4)	12,339 (91.0)
Residence, n (%)			0.004
Urban	129 (49.4)	5492 (40.5)
Rural	132 (50.6)	8071 (59.5)
Education, n (%)			< 0.001
Primary or below	206 (78.9)	8926 (65.8)
Middle school	29 (11.1)	2856 (21.1)
High school	14 (5.4)	1426 (10.5)
College or above	12 (4.6)	355 (2.6)
Cognition	8.10 ± 5.19	9.98 ± 5.22	< 0.001
Memory	2.67 ± 2.12	3.32 ± 2.21	< 0.001
Mental status	5.43 ± 3.67	6.56 ± 3.64	< 0.001

ISSN: 1471-2415