Table 1.
Baseline Patient Characteristics and Univariate Association With pLOS.
| n (%) | Patients With pLOS, % | OR (95% CI) | P | |
|---|---|---|---|---|
| Calendar year | – | – | 0.93 (0.83-1.03) | .153 |
| Demographics | ||||
| Agea (median) | 38 (IQR: 29-47) | – | 1.01 (0.93-1.09) | .896 |
| Gender | ||||
| Female | 3697 (85.5) | 9.9 | 1.81 (1.27-2.57) | .001 |
| Male | 628 (14.5) | 5.7 | ||
| Ethnicity | ||||
| Caucasian | 3014 (69.7) | 8.7 | 1.0 | – |
| African American | 381 (8.8) | 13.1 | 1.59 (1.15-2.20) | .024 |
| Hispanic | 277 (6.4) | 11.9 | 1.43 (0.97-2.10) | .185 |
| Otherb | 132 (3.1) | 6.8 | 0.77 (0.39-1.54) | .168 |
| Missingc | 521 (12.1) | 9.4 | 1.10 (0.80-1.51) | .787 |
| Median household income quartile (percentile)d | ||||
| 0-25th | 985 (22.8) | 11.6 | 1.0 | – |
| 26th-50th | 1124 (26) | 8.7 | 0.73 (0.55-0.97) | .444 |
| 51st-75th | 1130 (26.1) | 8.5 | 0.71 (0.53-0.94) | .285 |
| 76th-100th | 1085 (25.1) | 8.7 | 0.73 (0.54-0.97) | .406 |
| Hospital characteristics | ||||
| Hospital teaching status | ||||
| Teaching | 2295 (53.1) | 10.0 | 1.19 (0.97-1.46) | .099 |
| Nonteaching | 2030 (46.9) | 8.5 | ||
| Hospital location | ||||
| Urban | 3978 (92) | 9.4 | 1.14 (0.77-1.68) | .530 |
| Rural | 347 (8) | 8.4 | ||
| Hospital bed sizee | ||||
| Small | 474 (11) | 7.8 | 1.0 | – |
| Medium | 1087 (25.1) | 9.2 | 1.20 (0.81-1.77) | .632 |
| Large | 2764 (63.9) | 9.6 | 1.25 (0.88-1.79) | .256 |
Abbreviations: CI, confidence interval; IQR, interquartile range; OR, odds ratio; pLOS, prolonged length of stay.
a Age divided into groups of 10 years in the regression model.
b Includes Asian, Pacific Islander, Native American, and other.
c Racial information suppressed by some states.
d Median household income quartile for patient’s zip code during that year.
e Refer to http://www.hcup-us.ahrq.gov/db/vars/hosp_bedsize/nisnote.jsp for hospital bed size information.