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Table 2 Spearman’s rank correlation analysis of global sleep quality (global PSQI-J)

From: Purging behaviors relate to impaired subjective sleep quality in female patients with anorexia nervosa: a prospective observational study

Variables ρ ρ
Diagnosis of ANbp 0.525 0.017*
Age 0.345 0.136
Body mass index 0.168 0.479
Duration of illness 0.536 0.015*
Current menstruation 0.281 0.230
Use of sedative drugs 0.332 0.152
CES-D 0.318 0.172
Vomiting 0.561 0.010*
Chewing −0.061 0.798
Laxative overuse 0.407 0.075
Uretic misuse 0.280 0.232
  1. ANbp anorexia nervosa binge-eating/purging type, CES-D Center for Epidemiologic Studies Depression, PSQI-J Japanese version of the Pittsburgh Sleep Quality Index, ρ Spearman’s correlation coefficient
  2. *P < 0.05