Table 4 Cumulative reoperation rates of fusion surgeries according to anatomic regions during the entire follow up period
Entire period (n = 42,060) | Unadjusted value | Adjusted value | ||||
|---|---|---|---|---|---|---|
P | HR | 95% CI | p | HR | 95% CI | |
Region | ||||||
 Cervical fusion |  | 1.000 |  |  | 1.000 |  |
 Lumbar fusion | 0.0134 | 1.188 | (1.036, 1.362) | 0.0275 | 1.167 | (1.017,1.339) |
Age (years) | ||||||
 20–29 |  | 1.000 |  |  |  |  |
 30–39 | 0.7030 | 0.871 | (0.430, 1.768) |  |  |  |
 40–49 | 0.8510 | 0.940 | (0.492, 1.796) |  |  |  |
 50–59 | 0.4561 | 1.271 | (0.677, 2.387) |  |  |  |
 60–69 | 0.1760 | 1.543 | (0.823, 2.892) |  |  |  |
  ≥ 70 | 0.1671 | 1.559 | (0.830, 2.929) |  |  |  |
Gender | ||||||
 Male |  | 1.000 |  |  |  |  |
 Female | 0.7845 | 0.9840 | (0.873, 1.108) |  |  |  |
Diabetes | ||||||
 Yes | 0.0168 | 1.157 | (1.027, 1.303) |  |  |  |
 No |  | 1.000 |  |  |  |  |
Associated comorbidities | ||||||
 Yes | 0.0003 | 1.241 | (1.103, 1.397) | 0.0019 | 1.208 | (1.072,1.362) |
 No |  | 1.000 |  |  | 1.000 |  |
Hospital types | ||||||
 Tertiary-referral hospital |  | 1.000 |  |  | 1.000 |  |
 General hospital | 0.0113 | 1.212 | (1.044, 1.408) | 0.0455 | 1.166 | (1.003, 1.355) |
 Hospital | 0.0038 | 0.801 | (0.689, 0.931) | 0.0014 | 0.782 | (0.673, 0.910) |
 Clinic | 0.3403 | 0.711 | (0.352, 1.434) | 0.3434 | 0.712 | (0.353, 1.437) |