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Table 1 Distribution of patient characteristics by hospital admission

From: The effects of continuity of care on hospital utilization in patients with knee osteoarthritis: analysis of Nationwide insurance data

Unit: persons (%)
Category Total No Yes P-value †
N* % N* % N* %
Total number of patients 311,949 (100.0) 306,581 (98.2) 5368 (1.8)  
Gender Male 130,621 (41.9) 129,002 (42.1) 1619 (30.2) <  0.001
Female 181,328 (58.1) 177,579 (57.9) 3749 (69.8)  
Age (yr) ≤29 69,212 (22.2) 68,928 (22.5) 284 (5.3) <  0.001
30–39 30,770 (9.9) 30,529 (10.0) 241 (4.5)  
40–49 45,951 (14.7) 45,326 (14.8) 625 (11.6)  
50–59 64,555 (20.7) 63,058 (20.6) 1497 (27.9)  
60–69 49,299 (15.8) 47,973 (15.6) 1326 (24.7)  
70–79 52,162 (16.7) 50,767 (16.6) 1395 (26.0)  
Payer type NHI 298,290 (95.6) 293,263 (95.7) 5027 (93.6) <  0.001
Medicaid 13,413 (4.3) 13,077 (4.3) 336 (6.3)  
Others 246 (.1) 241 (.1) 5 (.1)  
Charlson comorbidity score 0 103,063 (33.0) 102,573 (33.5) 490 (9.1) <  0.001
1 47,059 (15.1) 46,472 (15.2) 587 (10.9)  
2 62,858 (20.2) 61,636 (20.1) 1222 (22.8)  
3+ 98,969 (31.7) 95,900 (31.3) 3069 (57.2)  
Frequency of hospitalization 0 306,581 (98.3) 306,581 (100.0) 0 (0.00) <  0.001
1 4065 (1.3)    4065 (75.7)  
2 846 (.2)    846 (15.8)  
3+ 457 (.1)    457 (8.5)  
Outpatient visits 1 103,808 (33.3) 103,585 (33.8) 223 (4.2) <  0.001
2–3 79,207 (25.4) 78,701 (25.7) 506 (9.4)  
4–7 60,431 (19.4) 59,368 (19.4) 1063 (19.8)  
8+ 68,503 (22.0) 64,927 (21.2) 3576 (66.6)  
Level of COC 0.76–1.00 78,012 (25.0) 77,519 (25.3) 493 (9.2) <  0.001
0.51–0.75 57,320 (18.4) 54,668 (17.8) 2652 (49.4)  
0.26–0.50 23,534 (7.5) 21,894 (7.2) 1640 (30.6)  
0.00–0.25 1470 (.5) 1366 (.4) 104 (1.9)  
Low (< 3 visits) 151,613 (48.6) 151,134 (49.3) 479 (8.9)  
Hospital type General hospital 16,730 (5.4) 15,920 (5.2) 810 (15.1) <  0.001
Hospital 32,457 (10.4) 30,644 (10.0) 1813 (33.8)  
Clinic 1588 (.5) 1454 (.5) 134 (2.5)  
LTC 175,322 (56.2) 173,278 (56.5) 2044 (38.1)  
Oriental hospital 1725 (.6) 1663 (.5) 62 (1.2)  
Oriental clinic 84,127 (27.0) 83,622 (27.3) 505 (9.4)  
Type of medicine Oriental 85,852 (27.5) 85,285 (27.8) 567 (10.6) <  0.011
Western 225,847 (72.5) 221,050 (72.2) 4797 (89.4)  
Region Urban 140,742 (45.1) 138,228 (45.1) 2514 (46.8) <  0.011
Rural 171,207 (54.9) 168,353 (54.9) 2854 (53.2)  
Ownership Public 2282 (.7) 2216 (.7) 66 (1.2) <  0.001
Corporate 25,316 (8.1) 24,197 (7.9) 1119 (20.8)  
Private 284,351 (91.2) 280,168 (91.4) 4183 (77.9)  
No. of beds ≤100 277,880 (89.1) 274,438 (89.5) 3442 (64.1) <  0.001
101–300 23,383 (7.5) 22,030 (7.2) 1353 (25.2)  
301–500 4099 (1.3) 3919 (1.3) 180 (3.4)  
501–700 2614 (.8) 2477 (.8) 137 (2.6)  
≥701 3973 (1.3) 3717 (1.2) 256 (4.8)  
  1. *Patient with overlapping records tallied as one patient (overlapping not allowed). †P for trend: Chi-square
  2. Abbreviations: NHI national health insurance, COC continuity of care, LTC long-term care hospital