Impact of Substance Use Disorder on Presentation and Short-Term Course of Schizophrenia

Table 1

Sociodemographic variables of schizophrenia patients with substance use disorder (Group 1) and without substance use disorder (Group 2).

Variables	Group 1 (𝑛=91) Mean ± s.d.	Group 2 (𝑛=52) Mean ± s.d.	𝑡	Sig	CI Lower bound	CI Upper bound
Age in years	31.01±8.16	27.84±7.41	2.305	0.023	0.450	5.88
Education years	9.31±4.66	9.90±4.40	−0.736	0.463	−2.156	0.99
Total duration of illness in days	2265±1982	1772±1462	1.563	0.120	−130.40	1115.10
Duration of untreated illness in days	1891±1730	1302±1149	2.190	0.030	57.246	1119.81
Age of onset in years	25.08±7.95	23.15±6.49	1.492	0.138	−0.628	4.49
CPZ equivalent antipsychotic dose in mg/day	350.28±122.45	356.80±146.59	−0.289	0.773	−57.720	33.81
Number of suicidal attempts	0.17±0.46	0.17±0.46	0.035	0.972	−0.1521	0.157

CI: confidence interval; “𝑡”: 𝑡 statistic; degree of freedom = 141.