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Table 4 Relative risk for hospital admission calculated using a negative binomial regression model

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

Category Unadjusted Adjusteda
RR 95% CI P-value RR 95% CI P-value
Gender
 Male 1.00     1.00    
 Female 1.88 0.58 0.68 < 0.0001 1.24 0.16 0.27 < 0.0001
Age (yr)
 ≤29 1.00     1.00    
 30–39 1.77 0.41 0.73 < 0.0001 1.51 0.24 0.58 < 0.0001
 40–49 3.51 1.13 1.38 < 0.0001 1.94 0.96 0.36 < 0.0001
 50–59 6.52 1.76 1.99 < 0.0001 4.56 1.85 1.18 < 0.0001
 60–69 7.77 1.94 2.17 < 0.0001 14.04 2.99 2.29 < 0.0001
 ≥70 8.89 2.07 2.30 < 0.0001 13.72 2.97 2.27 < 0.0001
Payer type
 National health insurance 1.00     1.00    
 Medicaid 2.00 0.61 0.78 < 0.0001 1.13 0.03 0.21 0.013
 Others 1.38 0.39 1.02 0.375 1.98 0.07 1.44 0.075
Hospital type
 General hospital 8.41 2.03 2.23 < 0.0001 12.50 2.40 2.65 < 0.0001
 Hospital 9.04 2.12 2.29 < 0.0001 11.50 2.35 2.53 < 0.0001
 Clinic 43.32 3.65 3.89 < 0.0001 57.54 3.91 4.20 < 0.0001
 Long-term care hospital 2.04 0.63 0.80 < 0.0001 2.00 0.61 0.78 < 0.0001
 Oriental hospital 8.67 1.96 2.36 < 0.0001 9.56 2.04 2.48 < 0.0001
 Oriental clinic 1.00     1.00    
Region
 Urban 1.00     1.00    
 Rural 0.94 0.10 0.01 0.010 0.99 0.06 0.04 0.643
Ownership
 Public 1.00     1.00    
 Corporate 1.60 0.26 0.68 < 0.0001 1.69 0.30 0.75 < 0.0001
 Private 0.47 0.96 0.56 < 0.0001 1.72 0.31 0.77 < 0.0001
COC
 0.76–1.00 1.00     1.00    
 0.51–0.75 8.88 2.10 2.27 < 0.0001 6.03 1.71 1.89 < 0.0001
 0.26–0.50 13.50 2.51 2.69 < 0.0001 8.56 2.05 2.24 < 0.0001
 0.00–0.25 17.36 2.68 3.03 < 0.0001 27.17 3.09 3.51 < 0.0001
 Low (< 3 visits) 0.64 0.55 0.33 < 0.0001 2.66 0.80 1.15 < 0.0001
Deviance/df      1.089
LL      − 5667.230
LL χ2      799.779
AIC      11,378.461
BIC      11,523.402
  1. aFitness information of the adjusted model
  2. Abbreviations: LL likelihood ratio, AIC akaike information criterion, BIC bayesian information criterion