. 2024 Feb 27;14:1334335. doi: 10.3389/fpsyt.2023.1334335

Table 2.

Demographic characteristics of the healthy controls, schizophrenia group, and the patients with and without treatment-resistant schizophrenia.

Variable	HC group	SCH group	TRS group	Non-TRS group	Statistical values
Variable	n = 489	n = 974	n = 435	n = 539	HC vs. SCH	HC vs. TRS vs. non-TRS
Sex: male/female, n	271/214^a	487/484^a	222/211	265/273	χ² = 4.243, p = 0.039	χ² = 4.633, p = 0.099
Age at blood sampling, years^*	36.68 (15.20)	46.64 (14.87)	49.29 (14.43)	44.45 (14.88)	t = 11.946, p < 0.001	F = 85.105, p < 0.001
Age at blood sampling, years^*	36.68 (15.20)	46.64 (14.87)	49.29 (14.43)	44.45 (14.88)	t = 11.946, p < 0.001	TRS > non-TRS > HC

^*These data are mean (SD).^aThe age at blood sampling was unknown for 19 patients in the schizophrenia (SCH) group and two in the healthy control (HC) group. TRS: treatment-resistant schizophrenia.