Table 2.

Risk for readmission within 48 months of discharge for the cohorts of individuals with first admission for psychosis in Taiwan, 1998–2007 (N=69 690)

	Risk for any readmission within 48 months (95% CI)
Time/stratum	1998–2000 (N=20 901)	2001–2004 (N=29 908)	2005–2007 (N=18 881)	p Values*
At 48 months
Full cohort	0.65 (0.65 to 0.66)	0.61 (0.60 to 0.61)	0.58 (0.57 to 0.59)	<0.0001
Urban cohort	0.65 (0.64 to 0.66)	0.60 (0.59 to 0.60)	0.57 (0.56 to 0.58)	<0.0001
Rural cohort	0.67 (0.65 to 0.68)	0.63 (0.62 to 0.64)	0.61 (0.60 to 0.62)	0.0001
Risk difference	0.02 (0.00 to 0.03)	0.03 (0.02 to 0.04)	0.04 (0.03 to 0.06)
Risk ratio	1.03 (1.01 to 1.05)	1.05 (1.03 to 1.08)	1.08 (1.05 to 1.11)
At 24 months
Full cohort	0.54 (0.54 to 0.55)	0.51 (0.50 to 0.51)	0.49 (0.48 to 0.50)	<0.0001
Urban cohort	0.54 (0.53 to 0.54)	0.50 (0.49 to 0.51)	0.48 (0.47 to 0.49)	<0.0001
Rural cohort	0.56 (0.55 to 0.57)	0.53 (0.51 to 0.54)	0.51 (0.50 to 0.53)	0.0022
Risk difference	0.02 (0.01 to 0.04)	0.03 (0.01 to 0.04)	0.04 (0.02 to 0.05)
Risk ratio	1.04 (1.01 to 1.07)	1.05 (1.02 to 1.08)	1.08 (1.04 to 1.11)

Probability of readmission within each stratum was estimated via the Kaplan–Meier estimator. When the risk difference or risk ratio was calculated, the urban cohort was used as the reference group.

*p Values for Wilcoxon trend tests.