Table 1.
Univariate associations between readmission within 30 days of discharge and various patient-level variables
| Variables | Total (N = 35,884) | Low inpatient volumes per psychiatrist (n = 8,969) | Mid-low inpatient volumes per psychiatrist (n = 8,909) | Mid-high inpatient volumes per psychiatrist (n = 9,186) | High inpatient volumes per psychiatrist (n = 9,042) | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Readmission | No readmission | P-value | Readmission | No readmission | P-value | Readmission | No readmission | P-value | Readmission | No readmission | P-value | Readmission | No readmission | P-value | |||||||||||
| N | % | N | % | N | % | N | % | N | % | N | % | N | % | N | % | N | % | N | % | ||||||
| Diagnosis | |||||||||||||||||||||||||
| Organic, including symptomatic, mental disorders | 121 | 3.2 | 3,690 | 96.8 | <.0001 | 6 | 0.5 | 1,173 | 99.5 | <.0001 | 11 | 1.5 | 738 | 98.5 | 0.1191 | 25 | 3.0 | 815 | 97.0 | <.0001 | 79 | 7.6 | 964 | 92.4 | <.0001 |
| Mental and behavioral disorders due to psychoactive substance use | 288 | 4.7 | 5,875 | 95.3 | 30 | 1.7 | 1,713 | 98.3 | 40 | 2.5 | 1,542 | 97.5 | 38 | 3.2 | 1,143 | 96.8 | 180 | 10.9 | 1,477 | 89.1 | |||||
| Schizophrenia, schizotypal, and delusional disorders | 797 | 10.5 | 6,802 | 89.5 | 37 | 3.1 | 1,148 | 96.9 | 35 | 2.0 | 1,759 | 98.0 | 94 | 4.7 | 1,918 | 95.3 | 631 | 24.2 | 1,977 | 75.8 | |||||
| Mood disorders | 274 | 2.1 | 12,603 | 97.9 | 50 | 1.6 | 3,067 | 98.4 | 50 | 1.5 | 3,329 | 98.5 | 63 | 1.8 | 3,514 | 98.2 | 111 | 4.0 | 2,693 | 96.0 | |||||
| Neurotic, stress-related, and somatoform disorders | 118 | 2.2 | 5,316 | 97.8 | 30 | 1.7 | 1,715 | 98.3 | 26 | 1.9 | 1,379 | 98.1 | 23 | 1.7 | 1,331 | 98.3 | 39 | 4.2 | 891 | 95.8 | |||||
| Length of stay (days) | |||||||||||||||||||||||||
| < 14 | 292 | 1.8 | 15,895 | 98.2 | <.0001 | 74 | 1.4 | 5,106 | 98.6 | 0.0177 | 74 | 1.8 | 3,927 | 98.2 | 0.8425 | 64 | 1.8 | 3,452 | 98.2 | <.0001 | 80 | 2.3 | 3,410 | 97.7 | <.0001 |
| ≥ 14 | 1,306 | 6.6 | 18,391 | 93.4 | 79 | 2.1 | 3,710 | 97.9 | 88 | 1.8 | 4,820 | 98.2 | 179 | 3.3 | 5,269 | 96.7 | 960 | 17.3 | 4,592 | 82.7 | |||||
| Sex | |||||||||||||||||||||||||
| Male | 1,029 | 6.5 | 14,807 | 93.5 | <.0001 | 70 | 1.9 | 3,610 | 98.1 | 0.2311 | 74 | 2.0 | 3,660 | 98.0 | 0.3268 | 157 | 4.3 | 3,518 | 95.7 | 0.3268 | 728 | 15.3 | 4,019 | 84.7 | <.0001 |
| Female | 569 | 2.8 | 19,479 | 97.2 | 83 | 1.6 | 5,206 | 98.4 | 88 | 1.7 | 5,087 | 98.3 | 86 | 1.6 | 5,203 | 98.4 | 312 | 7.3 | 3,983 | 92.7 | |||||
| Age (years) | |||||||||||||||||||||||||
| ≤ 29 | 124 | 2.0 | 6,150 | 98.0 | <.0001 | 28 | 1.7 | 1,593 | 98.3 | 0.0156 | 27 | 1.5 | 1,828 | 98.5 | 0.1145 | 31 | 1.9 | 1,582 | 98.1 | <.0001 | 38 | 3.2 | 1,147 | 96.8 | <.0001 |
| 30–39 | 228 | 4.4 | 4,919 | 95.6 | 31 | 2.7 | 1,120 | 97.3 | 32 | 2.3 | 1,375 | 97.7 | 51 | 4.0 | 1,216 | 96.0 | 114 | 8.6 | 1,208 | 91.4 | |||||
| 40–49 | 369 | 5.8 | 6,029 | 94.2 | 29 | 2.0 | 1,444 | 98.0 | 34 | 2.1 | 1,564 | 97.9 | 35 | 2.3 | 1,461 | 97.7 | 271 | 14.8 | 1,560 | 85.2 | |||||
| 50–59 | 345 | 4.9 | 6,701 | 95.1 | 25 | 1.4 | 1,736 | 98.6 | 36 | 2.2 | 1,635 | 97.8 | 52 | 2.9 | 1,745 | 97.1 | 232 | 12.8 | 1,585 | 87.2 | |||||
| 60–69 | 345 | 6.5 | 4,946 | 93.5 | 25 | 1.8 | 1,333 | 98.2 | 20 | 1.7 | 1,136 | 98.3 | 52 | 3.8 | 1,317 | 96.2 | 248 | 17.6 | 1,160 | 82.4 | |||||
| 70–79 | 187 | 3.3 | 5,541 | 96.7 | 15 | 0.9 | 1,590 | 99.1 | 13 | 1.1 | 1,209 | 98.9 | 22 | 1.5 | 1,400 | 98.5 | 137 | 9.3 | 1,342 | 90.7 | |||||
| Year | |||||||||||||||||||||||||
| 2010 | 120 | 2.3 | 5,124 | 97.7 | <.0001 | 17 | 0.7 | 2,396 | 99.3 | <.0001 | 27 | 1.4 | 1,837 | 98.6 | <.0001 | 8 | 1.4 | 561 | 98.6 | <.0001 | 68 | 17.1 | 330 | 82.9 | <.0001 |
| 2011 | 363 | 3.1 | 11,385 | 96.9 | 16 | 1.0 | 1,618 | 99.0 | 31 | 1.1 | 2,762 | 98.9 | 46 | 1.1 | 4,224 | 98.9 | 270 | 7.3 | 3,408 | 92.7 | |||||
| 2012 | 702 | 5.4 | 12,242 | 94.6 | 15 | 1.0 | 1,442 | 99.0 | 43 | 1.7 | 2,494 | 98.3 | 66 | 1.8 | 3,597 | 98.2 | 578 | 12.4 | 4,082 | 87.6 | |||||
| 2013 | 413 | 6.9 | 5,535 | 93.1 | 105 | 3.0 | 3,360 | 97.0 | 61 | 3.6 | 1,654 | 96.4 | 123 | 18.0 | 561 | 82.0 | 124 | 40.5 | 182 | 59.5 | |||||
| Total | 1,598 | 4.5 | 34,286 | 95.5 | 153 | 1.7 | 8,816 | 98.3 | 162 | 1.8 | 8,747 | 98.2 | 243 | 2.6 | 8,943 | 97.4 | 1,040 | 11.5 | 8,002 | 88.5 | |||||