The Temporal Relationship between Selected Mental Disorders and Substance-Related Disorders: A Nationwide Population-Based Cohort Study

Table 2

The follow-up profiles between the mental illness and the control groups.

	Mental Illness		Control
	(N=124,423)		(N=124,423)
The median duration of the onset of SRD (years)	1.54		3.22
The mean duration of the onset of SRD (mean, SD)	2.12	2.12	3.28	2.00
The subsequent onset of SRD (N, %)	4244	3.41%	861	0.69%
Alcohol-induced mental disorders	656	0.53%	68	0.05%
Drug-induced mental disorders	426	0.34%	33	0.03%
Alcohol dependence syndrome	1185	0.95%	159	0.13%
Drug dependence	554	0.45%	23	0.02%
Nondependent abuse of drugs	2173	1.75%	588	0.47%
The death (N, %)	10374	8.34%	8583	6.90%
The loss of follow-up (N, %)	212	0.17%	197	0.16%
Follow-up to the end year 2009 (N, %)	109593	88.08%	114782	92.25%

denotes the differences in the distributions for the variables between two groups were significant ().