Table 3. Logistic Regression Models Evaluating for Factors Associated With Mortality.
| Characteristic | Model 1: Univariate Analysis | Model 2: Multivariate Analysis With Preoperative Variables | Model 3: Multivariate Analysis With Preoperative and Postoperative Variables | |||
|---|---|---|---|---|---|---|
| Odds Ratio (95% CI) | P Value | Adjusted Odds Ratio (95% CI) | P Value | Adjusted Odds Ratio (95% CI) | P Value | |
| Surgery performed | ||||||
| Loop ileostomy | 1 [Reference] | NA | 1 [Reference] | NA | 1 [Reference] | NA |
| Total abdominal colectomy | 1.32 (0.99-1.75) | .06 | 1.22 (0.90-1.64) | .20 | 1.19 (0.88-1.61) | .25 |
| Age, y | 1.03 (1.02-1.04) | <.001 | 1.03 (1.02-1.04) | <.001 | ||
| Sex | ||||||
| Men | NA | NA | 1 [Reference] | NA | 1 [Reference] | NA |
| Women | 0.84 (0.67-1.05) | .14 | 0.84 (0.67-1.05) | .12 | ||
| Race/ethnicity | ||||||
| White | NA | NA | 1 [Reference] | NA | 1 [Reference] | NA |
| Individuals of color | 1.04 (0.80-1.33) | .79 | 1.03 (0.80-1.33) | .82 | ||
| Payer | ||||||
| Medicare | NA | NA | 1 [Reference] | NA | 1 [Reference] | NA |
| Medicaid | 1.55 (1.01-2.37) | .046 | 1.55 (1.01-2.36) | .04 | ||
| Private insurance | 0.78 (0.55-1.11) | .17 | 0.79 (0.55-1.12) | .19 | ||
| Self-pay | 0.55 (0.16-1.92) | .35 | 0.55 (0.16-1.88) | .34 | ||
| Others | 2.37 (1.06-1.23) | .02 | 2.31 (1.12-4.80) | .02 | ||
| Elixhauser index | ||||||
| 0 ~ 2 | NA | NA | 1.14 (1.07-1.23) | <.001 | 1.13 (1.05-1.21) | .02 |
| Median household income | ||||||
| First quartile (lowest) | NA | NA | 1 [Reference] | NA | 1 [Reference] | NA |
| Second quartile | 1.23 (0.92-1.65) | .17 | 1.26 (0.94-1.69) | .13 | ||
| Third quartile | 1.10 (0.80-1.52) | .56 | 1.09 (0.79-1.52) | .59 | ||
| Fourth quartile (highest) | 0.86 (0.62-1.20) | .39 | 0.86 (0.62-1.21) | .39 | ||
| Hospital-level variables | ||||||
| Bed size | ||||||
| Small | NA | NA | 1 [Reference] | NA | 1 [Reference] | NA |
| Medium | 1.11 (0.73-1.70) | .61 | 1.10 (0.72-1.67) | .67 | ||
| Large | 1.19 (0.82-1.74) | .36 | 1.18 (0.80-1.72) | .40 | ||
| Location/teaching status | ||||||
| Rural | NA | NA | 1 [Reference] | NA | 1 [Reference] | NA |
| Urban nonteaching | 1.14 (0.57-2.26) | .71 | 1.15 (0.57-2.31) | .69 | ||
| Urban teaching | 1.30 (0.67-2.54) | .44 | 1.30 (0.66-2.56) | .45 | ||
| Region | ||||||
| Northeast | NA | NA | 1 [Reference] | NA | 1 [Reference] | NA |
| Midwest | 0.76 (0.55-1.04) | .09 | 0.76 (0.55-1.05) | .10 | ||
| South | 0.91 (0.67-1.24) | .55 | 0.90 (0.66-1.23) | .51 | ||
| West | 0.57 (0.39-0.84) | .004 | 0.58 (0.39-0.85) | .01 | ||
| Outcome variables | ||||||
| Postoperative hemorrhage | NA | NA | NA | NA | 1.39 (0.84-2.30) | .20 |
| Wound disruption | 0.36 (0.17-0.76) | .01 | ||||
| Infectious complication | 0.54 (0.31-0.95) | .03 | ||||
Abbreviation: NA, not applicable.