PTH and insomnia: Using multiple logistic regression analysis to check if any biochemical variables had any influence on poor quality of sleep and insomnia, it was found that age, duration of dialysis, potassium, calcium, blood urea nitrogen (BUN), phosphate, parathyroid hormone (PTH), vitamin D3, hemoglobin, and sodium did not show any association with participants who had PSQI more than 5 (poor quality of sleep) and those with PSQI less than 5.