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Table 1 Baseline characteristics and outcomes of the study cohort summarized by their count and fraction (N (%)) for categorical or the mean and standard deviation for continuous variables, respectively

From: Development of a model for predicting the 4-year risk of symptomatic knee osteoarthritis in China: a longitudinal cohort study

Characteristics

Number of imputed data points

Total (N = 8193)

No symptomatic KOA (N = 7378)

Symptomatic KOA (N = 815)

P

Age, mean (SD) years

0

58.82 (9.01)

58.73 (9.06)

59.60 (8.45)

< 0.01

Sex

0

   

< 0.01

 Male

 

3942 (48.11)

3664 (49.66)

278 (34.11)

 

 Female

 

4251 (51.89)

3714 (50.34)

537 (65.89)

 

BMI, mean (SD) kg/m2

0

23.46 (3.49)

23.44 (3.47)

23.47 (3.48)

0.805

Waist circumference, mean (SD) cm

0

85.31 (9.58)

85.34 (9.54)

85.12 (9.56)

0.521

Residence area

0

   

< 0.01

 Rural, %

 

5406 (65.98)

4816 (65.28)

590 (72.39)

 

 Urban, %

 

2787 (34.02)

2562 (34.72)

225 (27.61)

 

Smoke behavior

40

   

< 0.01

 No smoking, %

 

4945 (60.36)

4374 (59.28)

571 (70.06)

 

 Ex-smoking, %

 

687 (8.39)

624 (8.46)

63 (7.73)

 

 Current smoking, %

 

2561 (31.26)

2380 (32.26)

181 (22.21)

 

ADL/IADL difficulty

16

   

< 0.01

 No, %

 

6283 (76.69)

5787 (78.44)

496 (60.86)

 

 Yes, %

 

1910 (23.31)

1591 (21.56)

319 (39.14)

 

MS

1312

   

0.708

 No, %

 

6794 (82.92)

6122 (82.98)

672 (82.45)

 

 Yes, %

 

1399 (17.08)

1256 (17.02)

143 (17.55)

 

Hip fracture

72

   

< 0.01

 No, %

 

7941 (96.92)

7167 (97.14)

774 (94.97)

 

 Yes, %

 

252 (3.08)

211 (2.86)

41 (5.03)

 

Depression

1427

   

< 0.01

 No, %

 

6132 (74.84)

5702 (77.28)

430 (52.76)

 

 Mild, %

 

1896 (23.14)

1561 (21.16)

335 (41.1)

 

 Moderate-to-severe, %

 

165 (2.01)

115 (1.56)

50 (6.13)

 

Comorbidities

0

   

< 0.01

 None, %

 

3778 (46.11)

3498 (47.41)

280 (34.36)

 

 1~2, %

 

3659 (44.66)

3253 (44.09)

406 (49.82)

 

 ≥ 3, %

 

756 (9.23)

627 (8.5)

129 (15.83)

 

Health status

3

   

< 0.01

 Very good, %

 

289 (3.53)

278 (3.77)

8 (0.98)

 

 Good, %

 

1075 (13.12)

1037 (14.06)

38 (4.66)

 

 Fair, %

 

2752 (33.59)

2538 (34.4)

214 (26.26)

 

 Poor, %

 

2957 (36.09)

2607 (35.33)

350 (42.94)

 

 Very poor, %

 

1120 (13.67)

915 (12.4)

205 (25.15)

 

Physical Activity Score

     

 VPA score

4743

   

0.507

  No PA, %

 

4942 (60.32)

4462 (60.48)

480 (58.9)

 

  Low level, %

 

590 (7.20)

524 (7.1)

66 (8.1)

 

  Middle-to-high level, %

 

2661 (32.48)

2392 (32.42)

269 (33.01)

 

 MPA score

4750

   

< 0.01

  No PA, %

 

3192 (38.96)

2914 (39.5)

278 (34.11)

 

  Low level, %

 

891 (10.88)

798 (10.82)

93 (11.41)

 

  Middle-to-high level, %

 

4110 (50.16)

3666 (49.69)

444 (54.48)

 

 LPA score

4751

   

0.842

  No PA, %

 

1586 (19.36)

1431 (19.4)

155 (19.02)

 

  Low level, %

 

1389 (16.95)

1245 (16.87)

144 (17.67)

 

  Middle-to-high level, %

 

5218 (63.69)

4702 (63.73)

516 (63.31)

 
  1. ADL, activities of daily living, BMI body mass index, IADL instrumental activities of daily living, LPA light physical activity, MPA moderate physical activity, MS metabolic syndrome, PA physical activity, SD standard deviation, VPA vigorous physical activity