Incidence and risk factors of symptomatic knee osteoarthritis among the Chinese population: analysis from a nationwide longitudinal study

Ren, Yan; Hu, Jiang; Tan, Jing; Tang, Xiaoming; Li, Qianrui; Yang, Huazhen; Liu, Chunrong; He, Qiao; Zou, Kang; Sun, Xin; Tan, Bo

doi:10.1186/s12889-020-09611-7

Table 1 Characteristics of respondents by status of symptomatic knee OA

From: Incidence and risk factors of symptomatic knee osteoarthritis among the Chinese population: analysis from a nationwide longitudinal study

Variables	All respondents			Symptomatic knee OA			Without symptomatic knee OA
Variables	No. (n = 13,077)	% unweighted	% weighted	No. (n = 1196)	% unweighted	% weighted	No. (n = 11,881)	% unweighted	% weighted
Gender
Male	6347	48.55	48.15	396	33.11	31.71	5951	50.11	50.11
Female	6726	51.45	51.85	800	66.89	68.29	5926	49.89	49.89
Age, years (mean ± SE)	13,077	64.24 ± 0.09	64.45 ± 0.13	1196	64.92 ± 0.27	64.75 ± 0.32	11,881	64.17 ± 0.09	64.42 ± 0.14
< 50	908	6.94	7.33	83	6.94	6.81	825	6.94	7.38
50–59	4043	30.92	31.36	318	26.59	26.73	3725	31.35	31.79
60–69	4776	36.52	34.88	461	38.55	38.89	4315	36.32	34.51
≥ 70	3350	25.62	26.43	334	27.93	27.57	3016	25.39	26.32
Area
Urban	8140	62.25	54.68	396	33.11	67.11	5951	50.11	61.42
Rural	4937	37.75	45.32	800	66.89	32.89	5926	49.89	38.58
Region
Central	4237	32.40	30.36	369	30.85	29.14	3868	32.56	30.47
East	4760	36.40	39.94	270	22.58	24.53	4490	37.79	41.37
West	4080	31.20	29.70	557	46.57	46.33	3523	29.65	28.16
Education
No formal education	3441	26.31	25.23	430	35.95	34.96	3011	25.34	24.32
Elementary school	5230	39.99	39.31	529	44.23	45.14	4701	39.57	38.78
Middle school	2839	21.71	21.81	163	13.63	13.72	2676	22.52	22.56
High school or Vocational school or higher	1567	11.98	13.65	74	6.19	6.18	1493	12.57	14.34
BMI group (kg/m²)
< 18.5	678	6.45	6.30	72	7.32	6.82	606	6.36	6.25
18.5–24.9	6615	62.90	62.65	609	61.95	61.38	6006	63.00	62.78
≥ 25.0	3223	30.65	31.04	302	30.72	31.80	2921	30.64	30.97
Done some activities (such as played a sport, social, or other kind of club dancing, doing physical exercise, doing Qigong,et al.)
Yes	705	5.39	7.03	800	66.89	2.89	5926	49.89	5.66
No	12,372	94.61	92.97	396	33.11	97.11	5951	50.11	94.34
Hypertension
Yes	2930	22.52	23.26	800	66.89	27.17	5926	49.89	22.15
No	10,079	77.48	76.74	396	33.11	72.83	5951	50.11	77.85
Dyslipidemia
Yes	1129	8.80	9.31	800	66.89	10.30	5926	49.89	8.74
No	11,704	91.20	90.69	396	33.11	89.70	5951	50.11	91.26
Diabetes
Yes	670	5.17	5.51	800	66.89	7.06	5926	49.89	5.15
No	12,291	94.83	94.49	396	33.11	92.94	5951	50.11	94.85
Chronic lung
Yes	1130	8.67	8.66	800	66.89	12.80	5926	49.89	8.29
No	11,901	91.33	91.34	396	33.11	87.20	5951	50.11	91.71
Liver disease
Yes	434	3.34	3.39	800	66.89	4.74	5926	49.89	3.15
No	12,559	96.66	96.61	396	33.11	95.26	5951	50.11	96.85
Heart disease
Yes	1335	10.27	10.10	800	66.89	16.81	5926	49.89	9.65
No	11,668	89.73	89.90	396	33.11	83.19	5951	50.11	90.35
Stroke
Yes	237	1.82	1.99	800	66.89	2.85	5926	49.89	1.73
No	12,811	98.18	98.01	396	33.11	97.15	5951	50.11	98.27
Kidney disease
Yes	671	5.16	5.29	800	66.89	8.88	5926	49.89	4.75
No	12,334	94.84	94.71	396	33.11	91.12	5951	50.11	95.25
Digestive disease
Yes	2671	20.48	19.88	800	66.89	30.48	5926	49.89	19.29
No	10,374	79.52	80.12	396	33.11	69.52	5951	50.11	80.71
Psychiatric disease
Yes	166	1.27	1.53	800	66.89	1.62	5926	49.89	1.22
No	12,860	98.73	98.47	396	33.11	98.38	5951	50.11	98.78
Asthma
Yes	394	3.02	3.01	800	66.89	5.01	5926	49.89	2.86
No	12,636	96.98	96.99	396	33.11	94.99	5951	50.11	97.14

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ISSN: 1471-2458

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