Table 3.
Median LOS, and incidence rate ratios (IRR) and confidence intervals from unadjusted and adjusted negative binomial regression models. All analyses account for survey weighting.
| Median LOS (IQR) | Univariable Analysis | Multivariable analysis* | |||||
|---|---|---|---|---|---|---|---|
| IRR | 95%CI | P-value | aIRR | 95%CI | P-value | ||
| Race/ethnicity | |||||||
| White | 5 (3–6) | 1.00 | - | - | 1.00 | - | - |
| Black | 5 (4–9) | 1.29 | 1.17–1.42 | <0.001 | 1.15 | 1.05–1.27 | 0.004 |
| Hispanic | 5 (4–8) | 1.23 | 1.12–1.35 | <0.001 | 1.11 | 1.02–1.21 | 0.014 |
| Other | 5 (3–7) | 1.15 | 1.02–1.30 | 0.025 | 1.12 | 1.01–1.23 | 0.024 |
| Missing | 5 (3–7) | 1.09 | 0.98–1.20 | 0.110 | 1.10 | 0.99–1.21 | 0.077 |
| Age (per year) | - | 1.00 | 0.99–1.01 | 0.256 | 1.00 | 0.99–1.00 | 0.585 |
| Sex | |||||||
| Male | 5 (3–7) | 1.00 | - | - | 1.00 | - | - |
| Female | 5 (3–7) | 0.99 | 0.94–1.05 | 0.831 | 1.00 | 0.95–1.05 | 0.900 |
| Payer | |||||||
| Private | 5 (3–6) | 1.00 | - | - | 1.00 | - | - |
| Medicaid/self-pay | 5 (4–8) | 1.25 | 1.18–1.32 | <0.001 | 1.14 | 1.07–1.21 | <0.001 |
| Medicare/no charge/other | 5 (3–8) | 1.33 | 1.11–1.59 | 0.002 | 1.21 | 1.02–1.45 | 0.033 |
| Hospital location/teaching status | |||||||
| Rural | 4 (2–5) | 1.00 | - | - | 1.00 | - | - |
| Urban nonteaching | 5 (3–7) | 1.40 | 0.97–2.01 | 0.071 | 1.41 | 1.07–1.87 | 0.016 |
| Urban teaching | 5 (3–7) | 1.29 | 0.95–1.74 | 0.106 | 1.36 | 1.09–1.71 | 0.007 |
| Hospital region | |||||||
| Northeast | 5 (3–6) | 1.00 | - | - | 1.00 | - | - |
| Midwest | 5 (3–6) | 1.01 | 0.92–1.11 | 0.877 | 0.99 | 0.91–1.09 | 0.858 |
| South | 5 (4–7) | 1.11 | 1.02–1.22 | 0.017 | 1.09 | 1.00–1.18 | 0.053 |
| West | 5 (4–7) | 1.12 | 0.99–1.26 | 0.067 | 1.08 | 0.98–1.19 | 0.122 |
| KID Vintage Year | |||||||
| 2016 | 5 (3–7) | 1.00 | - | - | 1.00 | - | - |
| 2019 | 5 (3–7) | 0.99 | 0.92–1.07 | 0.767 | 1.01 | 0.95–1.08 | 0.705 |
| Debridement (Ref: no debridement) | |||||||
| No | 4 (3–6) | 1.00 | - | - | 1.00 | - | - |
| Yes | 5 (4–8) | 1.35 | 1.27–1.44 | <0.001 | 1.31 | 1.23–1.38 | <0.001 |
| CVC placed (Ref: no CVC) | |||||||
| No | 4 (3–6) | 1.00 | - | - | 1.00 | - | - |
| Yes | 6 (4–9) | 1.44 | 1.33–1.56 | <0.001 | 1.41 | 1.31–1.51 | <0.001 |
| Complex chronic condition | |||||||
| No | 5 (3–7) | 1.00 | - | - | 1.00 | - | - |
| Yes | 6 (4–9) | 1.25 | 1.14–1.37 | <0.001 | 1.21 | 1.11–1.33 | <0.001 |
| Admission on a weekend | |||||||
| No | 5 (3–7) | 1.00 | - | - | 1.00 | - | - |
| Yes | 5 (3–7) | 1.01 | 0.93–1.09 | 0.866 | 0.99 | 0.93–1.07 | 0.883 |
| Discharge quarter | |||||||
| Quarter 1 | 5 (3–7) | 1.00 | - | - | 1.00 | - | - |
| Quarter 2 | 5 (3–7) | 1.03 | 0.96–1.11 | 0.378 | 1.02 | 0.95–1.10 | 0.515 |
| Quarter 3 | 5 (3–7) | 1.00 | 0.92–1.08 | 0.982 | 1.01 | 0.94–1.08 | 0.866 |
| Quarter 4 | 5 (3–7) | 1.02 | 0.94–1.10 | 0.658 | 1.00 | 0.94–1.08 | 0.902 |
| Hospital size | |||||||
| Small | 5 (3–7) | 1.00 | - | - | 1.00 | - | - |
| Medium | 5 (3–7) | 0.96 | 0.86–1.06 | 0.405 | 1.02 | 0.93–1.11 | 0.714 |
| Large | 5 (3–7) | 1.03 | 0.93–1.14 | 0.605 | 1.07 | 0.98–1.17 | 0.134 |
| ZIP code median income quartile | |||||||
| First (poorest) | 5 (4–8) | 1.00 | - | - | 1.00 | - | - |
| Second | 5 (3–7) | 0.94 | 0.87–1.02 | 0.164 | 1.01 | 0.94–1.10 | 0.732 |
| Third | 5 (3–7) | 0.88 | 0.81–0.96 | 0.003 | 0.97 | 0.89–1.05 | 0.448 |
| Fourth (wealthiest) | 5 (3–6) | 0.84 | 0.78–0.90 | <0.001 | 0.99 | 0.91–1.07 | 0.805 |
*
Analysis is adjusted for age, sex, insurance, hospital location/teaching status, hospital region, KID year, CVC placement, debridement procedure, complex chronic condition, weekend admission, discharge quarter, hospital size, and ZIP code median income quartile.
Abbreviations: aIRR – adjusted incidence rate ratio; CVC – central venous catheter; IQR – interquartile range; IRR – incidence rate ratio; LOS – length of stay; ZIP code - Zone Improvement Plan code; 95%CI – 95% confidence interval