Table 2.

Manual backward elimination and binary logistic regression analysis to determine the risk of MA psychosis

Risk factor	β	SE β	OR (95% CI)
Intercept	−4.05***	0.91	0.02 (0.00 to 0.10)
Male (vs female)	1.39**	0.48	4.03 (1.59 to 10.20)
MA dependence (vs MA abuse)	2.24**	0.79	9.41 (2.01 to 44.00)
History of hospitalisation for substance abuse (vs no history)	1.35***	0.33	3.85 (2.03 to 7.28)
≥16 days of MA use in the past month (vs ≤15 days in the past month)	0.86*	0.33	2.35 (1.22 to 4.52)

Nagelkerke R ² (Cragg and Uhler)=0.26. Hosmer and Lemeshow goodness of fit test: χ²=1.39, df=8, p value=0.99.

*p<0.05, **p<0.01, ***p<0.001.

MA, methamphetamine.