Disease duration-stratified associations of thyroid hormone levels with psychopathology in hospitalized patients with schizophrenia: A cross-sectional study

Table 2 Correlations between thyroid hormone levels and age, disease duration, and antipsychotic dose in stable schizophrenia patients, stratified by disease duration

Variable	Total participants			0-10 years group			10.1-20 years group			> 20 years group
	Age	Disease duration	Chlorpromazine equivalent dose	Age	Disease duration	Chlorpromazine equivalent dose	Age	Disease duration	Chlorpromazine equivalent dose	Age	Disease duration	Chlorpromazine equivalent dose
TSH	0.021	0.013	0.02	0.024	-0.21	0.058	0.033	0.103	-0.076	0.036	0.031	0.068
FT3	-0.174b	0.001	-0.08	-0.263a	-0.106	-0.013	-0.194	0.089	-0.022	-0.206a	-0.012	-0.157
FT4	0.079	0.155a	-0.130a	-0.131	-0.06	-0.107	-0.059	0.024	-0.092	0.055	-0.058	-0.134
T3	0.021	0.118	-0.273b	-0.055	0.061	-0.135	0.026	0.289a	-0.230a	-0.084	0.019	-0.365b
T4	0.04	0.177b	-0.192b	-0.023	0.182	-0.166	-0.105	0.246a	-0.074	-0.005	0.043	-0.246a

^aP < 0.05.

^bP < 0.001.

The P value obtained by comparing the three groups stratified by disease duration. TSH: Thyroid stimulating hormone; T3: Triiodothyronine; FT3: Free triiodothyronine; T4: Thyroxine; FT4: Free thyroxine.