Table 2.
Comparison cases and controls in the propensity-matched sample of major abdominal and pelvic procedures. aSeverity of illness as defined in this database: All Patient Refined DRG-Severity of Illness Subclass (APRDRG-Severity), 1 = Minor loss of function, includes cases with no comorbidity or complications, 2 = Moderate loss of function, 3 = Major loss of function and 4 = Extreme loss of function]. Frequency and percentage are used for discrete variables. Mean and standard deviation are used for continuous variables.
| Characteristics | Propensity-matched data set (Abdominal and pelvic major procedures) |
|||
|---|---|---|---|---|
| Cases (n = 1144) | Controls (n = 1144) | p value | ||
| Age, mean (SD), year | 52.62(18.54) | 53.08(18.95) | 0.552 | |
| Female gender | 763(66.70) | 801(70.02) | 0.096 | |
| Race/ethnicity | White | 628(54.86) | 605(52.88) | 0.707 |
| Black | 130(11.36) | 121(10.58) | ||
| Hispanic | 115(10.05) | 142(12.41) | ||
| Other/unknown | 272(23.73) | 276(22.13) | ||
| Severity of illnessa | 1 | 287(25.09) | 287(25.09) | 0.982 |
| 2 | 423(36.98) | 375(32.78) | ||
| 3 | 277(24.21) | 324(28.32) | ||
| 4 | 157(13.72) | 158(13.81) | ||
| Obesity | Yes | 120(10.49) | 131(11.45) | 0.504 |
| No | 1024(89.51) | 1013(88.55) | ||
| Morbid obesity | Yes | 73(6.38) | 59(5.16) | 0.244 |
| No | 1071(93.62) | 1085(94.84) | ||
| Procedure urgency | Elective | 582(51.05) | 422(37.02) | <0.001 |
| Non-elective | 558(48.95) | 718(62.98) | ||
| Teaching hospital | Yes | 600(52.86) | 577(50.93) | 0.378 |
| No | 535(47.14) | 556(49.07) | ||
| Hospital location | Rural | 136(11.98) | 101(8.91) | 0.019 |
| Urban | 999(88.02) | 1032(91.09) | ||
| Hospital RN percentage, mean (SD) | 93.29(6.23) | 93.77(6.75) | 0.089 | |
| Hospital ownership | Public | 138(15.32) | 118(13.11) | 0.439 |
| Private (none-for-profit) | 651(72.25) | 664(73.78) | ||
| Private | 112(12.43) | 118(13.11) | ||
| Hospital bedsize | Small | 120(10.57) | 120(10.59) | 0.495 |
| Medium | 278(24.49) | 256(22.59) | ||
| Large | 737(64.93) | 757(66.81) | ||
| Health insurance | Medicare | 369(32.26) | 384(33.71) | 0.541 |
| Medicaid | 177(15.47) | 159(13.96) | ||
| Private | 498(43.53) | 490(43.02) | ||
| Other/unknown | 100(8.74) | 111(9.31) | ||
| Year of admission | 2007 | 234(20.45) | 233(20.37) | 0.999 |
| 2008 | 243(21.24) | 195(17.05) | ||
| 2009 | 209(18.27) | 295(25.79) | ||
| 2010 | 221(19.32) | 183(16.00) | ||
| 2011 | 237(20.72) | 238(20.80) | ||