Table 1.
Characteristics of the study populations
| Appendectomy (n = 9,606) | Intestinal operations (n = 2,264) | Combined population (n=12,270) | P value | |
|---|---|---|---|---|
| Mean Age (SD) | 11.21 (3.66) | 10.55 (4.79) | 11.07 (3.94) | <0.001a |
| % Female | 40.7% | 46.06 | 41.87% | <0.001b |
| % Hispanic | 22.5% | 8.63% | 19.50% | <0.001b |
| Race | <0.001b | |||
| White | 76.99% | 77.18% | 77.03% | |
| Black/African American | 9.10% | 11.64% | 9.65% | |
| Asian | 2.19% | 2.67% | 2.29% | |
| American Indian, Alaska Native, Native Hawaiian, Pacific Islander | 0.51% | 0.60% | 0.53% | |
| Discharged home | 99.67% | 98.24% | 99.36% | <0.001b |
| General anesthesia | 99.90 | 99.90% | 99.85% | 0.019b |
| Case type | <0.001b | |||
| Elective | 12.42% | 45.53% | 19.61% | |
| Emergent | 60.88% | 38.21% | 55.96% | |
| Urgent | 26.70% | 16.25% | 24.43% | |
| Laparoscopic (or combined) | 90.12% | 25.79% | 76.15% | <0.001b |
| ASA Class | <0.001 b | |||
| 1 | 50.69% | 37.73% | 47.87% | |
| 2 | 43.87% | 45.27% | 44.17% | |
| 3 | 5.09% | 14.79% | 7.20% | |
| 4 | 0.16% | 1.80%% | 0.51% | |
| 5 | 0% | 0.23 | 0.05% | |
| Wound classification | <0.001b | |||
| Clean | 2.18% | 14.94% | 4.95% | |
| Clean/contaminated | 27.85% | 44.89% | 31.55% | |
| Contaminated | 45.74% | 25.56% | 41.36% | |
| Dirty/infected | 24.23% | 14.60% | 22.14% |
Footnotes: Statistical tests were performed to evaluate for differences between the appendectomy subgroup and the intestinal operation subgroup. The test used is indicated in the column after the p value
a
represents t-test
b
represents chi2.