PTH and diabetic retinopathy: However, no significant differences were observed in sex, age, resting heart rate (RHR), waist circumference, BMI, hypertension (HBP), nocturnal hypoglycemia, HbA1c, blood phosphorus (P), TG, TC, HDL-C, LDL-C, BUN, TSH, FT3, FT4, fasting C-peptide, UA, PTH, peripheral arterial disease (PAD), diabetic kidney disease (DKD), and diabetic retinopathy (DR) (p > 0.05) (Table 1).