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Table 1 Baseline characteristics of male and female

From: Prevalence and factors associated with knee osteoarthritis among middle-aged and elderly individuals in rural Tianjin: a population-based cross-sectional study

Characteristics

Male

Female

Total

Cases, n (%)

1950 (49.7)

1974 (50.3)

3924 (100)

Age, year, mean (SD)

58.44 (9.25)

58.62 (9.16)

58.53 (9.20)

Age group, n (%)

   

 < 55 years

697 (35.9)

696 (35.5)

1393 (35.7)

 55–64 years

663 (34.1)

681 (34.7)

1344 (34.4)

 65–74 years

525 (27.0)

504 (25.7)

1029 (26.4)

 ≥ 75 years

58 (3.0)

81 (4.1)

139 (3.6)

Education, means (SD), years

7.59 (2.82)

6.60 (3.49)

7.10 (3.21)

Education, n (%)

   

 Illiterate

68 (3.5)

281 (14.2)

349 (8.9)

 Primary level

542 (27.8)

560 (28.4)

1102 (28.1)

 Elementary level

1075 (55.2)

914 (46.3)

1989 (50.7)

 High school

240 (12.3)

200 (10.1)

440 (11.2)

 ≥ College

23 (1.2)

17 (0.9)

40 (1.0)

Smoking, n (%)

   

 Never smoking

885 (45.5)

1919 (97.4)

2804 (71.6)

 Ex-smoker

147 (7.6)

10 (0.5)

157 (4.0)

 Current smoker

914 (47.0)

41 (2.1)

955 (24.4)

Drinking, n (%)

   

 Never drinking

982 (50.5)

1945 (98.8)

2927 (74.8)

 Ex-drinker

78 (4.0)

0 (0.0)

78 (2.0)

 Current drinker

886 (45.5)

24 (1.2)

910 (23.2)

BMI, means (SD), kg/m2

24.49 (3.53)

25.14 (6.50)

24.82 (5.25)

BMI group, n (%)

   

 Normal

889 (46.1)

713 (36.6)

1602 (41.3)

 Over weight

786 (40.8)

863 (44.3)

1649 (42.5)

 Obesity

253 (13.1)

374 (19.2)

627 (16.2)

Sleeping time, means (SD), hours

7.64 (1.03)

7.44 (0.94)

7.54 (0.99)

Sleep situation, n (%)

   

 Satisfy

1672 (86.4)

1435 (73.0)

3107 (79.7)

 Not bad

154 (8.0)

340 (17.3)

494 (12.7)

 Insufficient

109 (5.6)

190 (9.7)

299 (7.7)

Often walk

   

 Yes

439 (23.0)

668 (34.3)

1107 (28.7)

 No

1468 (77.0)

1280 (65.7)

2748 (71.3)