Serum levels of hormones in patients with insomnia and controls.

Abbreviations: PI, primary insomnia; DCI, depression-comorbid insomnia; HPA, Hypothalamus-pituitary-adrenal; HPT, Hypothalamus-pituitary-thyroid; HPG, Hypothalamus-pituitary-gonads; CRH, corticotrophin-releasing hormone; ACTH, adenocorticotropic hormone; TRH, thyrotrophin-releasing hormone; TSH, thyroid stimulating hormone; TT3, total triiodothyronine; TT4, total thyroxine; GnRH, gonadotropin-releasing hormone. Expression: normal distribution variables (Means [SD]); nonnormal distribution variables (P50 [P25, P75]). *P<0.05, Denotes a significant difference compared to controls; #P<0.05, Compared to DCI group.