From: Factors affecting hospital stay in psychiatric patients: the role of active comorbidity
 | Number referrals | Median | Mean (SD) | U* | Exact Sig. | Z** | Exact Sig. |
---|---|---|---|---|---|---|---|
Schizophrenia | 0 referrals | 14 | 16.46 (9.615) | Â | Â | Â | Â |
 | 1 referral | 18 | 21.52 (12.136) | 2230a | 0.008a |  |  |
 | 2 referrals | 19.5 | 20.17 (8.535) | 852b | 0.013b | 1.657b | 0.002b |
 | 3 referrals | 27 | 29.78 (12.804) | 374c | 0.000c | 1.901c | 0.000c |
Bipolar | 0 referrals | 14 | 15.44 (7.641) | Â | Â | Â | Â |
 | 1 referral | 14.5 | 16.25 (8.412) | 4614a | 0.364a |  |  |
 | 2 referrals | 19 | 23.17 (11.111) | 756b | 0.001b | 1.559b | 0.003b |
 | 3 referrals | 19 | 22.50 (10.071) | 252c | 0.024c | 1.011c | 0.082c |
Both groups | 0 referrals (n = 208) | 14 | 15.93 (8.640) |  |  |  |  |
 | 1 referral (n = 146) | 15 | 18.34 (10.346) | 13502a | 0.038a |  |  |
 | 2 referrals (n = 48) | 19.5 | 21.67 (9.917) | 3158b | 0.000b |  |  |
 | 3 referrals (n = 26) | 26 | 27.54 (12.313) | 1234c | 0.000c |  |  |