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Table 3 Linear mixed models: Associations between problematic substance use and changes in hospitalisation (n = 128)

From: Hospitalisation of severely mentally ill patients with and without problematic substance use before and during Assertive Community Treatment: an observational cohort study

Variables New admissions Total inpatient days Involuntary inpatient days
Regression coefficient (SE) p-value Regression coefficient (SE) p-value Regression coefficient (SE) p-value
Problematic substance use (Y/N) 0.35 (0.91) 0.698 −113.00 (151.19) 0.456 56.30 (30.21) 0.065
BPRS Positive symptoms 0.35 (0.45) 0.439 −11.01 (16.23) 0.499 −13.93 (14.78) 0.348
BPRS negative symptoms −0.45 (0.38) 0.230 19.83 (13.97) 0.159 17.70 (12.71) 0.166
BPRS agitation mania 0.56 (0.51) 0.277 −34.80 (19.49) 0.077 −35.55 (17.35) 0.043
BPRS anxiety/depressive symptoms −0.88 (0.43) 0.042 −20.58 (15.24) 0.180 −19.15 (14.18) 0.180
GAF-S 0.16 (0.07) 0.027 3.46 (3.38) 0.308 −2.45 (2.36) 0.301
GAF-F −0.12 (0.08) 0.151 −9.18 (4.38) 0.037 −0.68 (2.80) 0.809
PSF 15.02 (11.40) 0.191 8.68 (10.16) 0.395
Age 0.01 (0.04) 0.819 −1.95 (1.56) 0.214 −0.46 (1.45) 0.754
Gender −0.58 (0.89) 0.514 51.78 (32.46) 0.114 53.40 (29.41) 0.072
Problematic substance use*GAF-S    −8.25 (4.52) 0.071*   
Problematic substance use*GAF-F    12.31 (5.77) 0.035*   
  1. *P-values below 0.10 were considered significant for interactions