Investigating factors associated with the number of rehospitalizations among patients with schizophrenia disorder using penalized count regression models

Table 4 Description of clinical characteristics of patients with schizophrenia (n = 413)

Variable	Variable levels	Frequency (%)	Mean ± SD^a	P-value^§
Age at onset of illness (year)	< 20	129 (31.24)	1.55 ± 2.64	0.134
26.44 ± 10.48	20–29	166 (40.19)	1.17 ± 2.27
	30–39	74 (17.92)	0.88 ± 1.33
	≥ 40	44 (10.65)	0.93 ± 1.30
Duration of illness (year)	< 1	42 (10.17)	0.02 ± 0.15	< 0.001
9.72 ± 8.32	1–9	213 (51.57)	0.79 ± 1.23
	10–19	92 (22.28)	1.68 ± 2.53
	≥ 20	66 (15.98)	2.67 ± 3.51
Having a family history of psychiatric illness	Yes	181 (43.83)	1.54 ± 2.76	0.011
Having a family history of psychiatric illness	No	232 (56.17)	0.96 ± 1.55	0.011
Having a history of medical disease	Yes	177 (42.90)	1.36 ± 2.11	0.233
Having a history of medical disease	No	236 (57.10)	1.10 ± 2.24	0.233
Having a history of non-adherence to antipsychotic drugs	Yes	303 (73.37)	1.21 ± 2.33	0.982
Having a history of non-adherence to antipsychotic drugs	No	110 (26.63)	1.21 ± 1.71	0.982
Having a history of the suicide attempt	Yes	81 (19.61)	1.47 ± 2.57	0.240
Having a history of the suicide attempt	No	332 (80.39)	1.15 ± 2.08	0.240

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