Table 4. Effects of diabetes mellitus on the number of operations in burn survivors (n=3,097).
| Variable | Category | Simple Poisson regression analyses* | Multiple Poisson regression analysis* | ||
|---|---|---|---|---|---|
| Mean ratio (95% CI) | p-value | Adjusted mean ratio (95% CI) | p-value | ||
| Sex | Female | Reference | - | ||
| Male | 1.402 (1.290~1.523) | <0.001 | |||
| Age (year) | 1.001 (0.999~1.004) | 0.311 | 0.994 (0.991~0.997) | <0.001 | |
| Diabetes mellitus | Absent | Reference | - | Reference | - |
| Present | 1.463 (1.302~1.643) | <0.001 | 1.576 (1.391~1.785) | <0.001 | |
| Season | <0.001 | <0.001 | |||
| Summer | Reference | - | Reference | - | |
| Autumn | 1.031 (0.910~1.169) | 0.629 | 1.112 (0.979~1.262) | 0.102 | |
| Spring | 1.107 (0.995~1.232) | 0.062 | 1.243 (1.116~1.385) | <0.001 | |
| Winter | 1.365 (1.227~1.519) | <0.001 | 1.499 (1.345~1.670) | <0.001 | |
| Body surface area (%) | <0.001 | <0.001 | |||
| <10 | Reference | - | Reference | - | |
| 10 to <20 | 2.572 (2.313~2.860) | <0.001 | 2.722 (2.441~3.034) | <0.001 | |
| 20 to <30 | 4.851 (4.279~5.498) | <0.001 | 4.968 (4.376~5.639) | <0.001 | |
| 30 to <50 | 7.091 (6.225~8.077) | <0.001 | 7.113 (6.231~8.120) | <0.001 | |
| 50 to <70 | 8.946 (7.332~10.915) | <0.001 | 9.781 (7.979~11.990) | <0.001 | |
| ≥70 | 9.798 (6.300~15.238) | <0.001 | 11.429 (7.315~17.856) | <0.001 | |
| Blood urea nitrogen (mg/dL) | 1.008 (1.002~1.013) | 0.010 | 1.009 (1.003~1.014) | 0.003 | |
| Creatinine (mg/dL) | 1.103 (1.046~1.163) | <0.001 | |||
| Systolic blood pressure (mmHg) | <0.001 | 0.005 | |||
| 110 to <120 | Reference | - | Reference | - | |
| 120 to <130 | 1.037 (0.925~1.163) | 0.529 | 0.989 (0.882~1.109) | 0.848 | |
| ≥130 | 1.504 (1.351~1.675) | <0.001 | 1.105 (0.988~1.236) | 0.080 | |
| <110 | 1.253 (1.070~1.467) | 0.005 | 1.252 (1.068~1.467) | 0.006 | |
CI: confidence interval. *A logarithmic link function was used in the Poisson regression analyses.