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Table 1 Comparison of general, clinical and socioeconomic characteristics between 2013 and 2015

From: Establishment of a qualified integrated care system after total knee arthroplasty as a role of regional rheumatoid and degenerative arthritis centers

Variables 2013 2014 2015 p value
Numbers 227 225 258  
Age 71.7 ± 5.9 71.3 ± 6.2 72.7 ± 5.4 0.24
 ≤ 59 5 (2.2) 6 (2.7) 4 (1.6) 0.094
60–69 76 (33.5) 79 (35.1) 61 (23.3)
70–79 126 (55.5) 125 (55.6) 170 (65.9)
 ≥ 80 20 (8.8) 15 (6.7) 23 (8.9)
Elderly (≥ 65) 204 (89.9) 200 (88.9) 239 (92.6) 0.339
Old-elderly (≥ 70) 146 (64.3) 141 (62.3) 193(74.8) 0.006 **
Very elderly (≥ 80) 20 (8.8) 15 (6.7) 23 (8.9) 0.609
Sex (female: male) 206 (90.7): 21 (9.3) 201 (89.3): 24 (10.7) 212 (82.2): 46 (17.8) 0.009 **
Op site (Right) 93 (41.0) 92 (40.9) 119 (46.1) 0.404
BMI 26.8 ± 3.2 26.1 ± 3.5 26.3 ± 3.6 0.076
Weight 62.2 ± 9.3 61.7 ± 9.4 62.7 ± 10.5 0.546
Obesity 165 (72.7) 130 (57.8) 154 (59.7) 0.002 **
LOS 16.7 ± 2.2 16.8 ± 3.5 16.3 ± 1.5 0.08
VAS 5.7 ± 0.7 5.8 ± 0.4 5.8 ± 0.5 0.052
K-L grade
 3/4 75 (33.0)/152 (67.0) 59 (26.2)/166 (73.8) 63 (24.4)/195 (75.6) 0.088
Education
 No formal education 31 (13.7) 28 (12.4) 12 (4.7) 0.001 **
Occupation
 Manual work 16 (7.0) 34 (15.1) 133 (51.6)  < 0.001 **
Urban residence
 Urban: Country 137 (60.4): 90 (39.6) 132 (58.7): 93 (41.3) 152 (58.9): 106 (41.1) 0.924
Location of residence (Current administrative districts)
 Jeju: Seogwipo 149 (65.6): 78 (34.4) 148 (65.8): 77 (34.2) 174 (67.4): 84 (32.6) 0.895
Former administrative districts
 Jeju city 111 (48.9) 104 (46.2) 122 (47.3) 0.848
Medical insurance
 NHI: Medicaid 209 (92.1): 18 (7.9) 215 (95.6): 10 (4.4) 249 (96.5): 9 (3.5) 0.074
  1. Values are mean ± standard deviation or numbers (%)
  2. Op operation, BMI body mass index, LOS length of stay, VAS visual analogue scale, K-L Kellgrene-Lawrence, NHI national health insurance