Correlation and regression analysis for serum levels of hormones and PSQI scores.

Abbreviations: PI, primary insomnia; DCI, depression-comorbid insomnia; PSQI, Pittsburgh Sleep Quality Index; 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.aAll requested variables (CRH, ACTH, cortisol, TRH, TSH, TT3, TT4 and GnRH) entered.*P**P