Table 3.

The odds ratio for low body weight (BMI < 18.5 kg/m²) with the increased serum level of PTH.

Per doubling of PTHa (per 68.3 pg/ml)	OR	95%CI	P
Model 1	1.053	1.028, 1.078	<0.0001
Model 2	1.051	1.026, 1.076	<0.0001
Model 3	1.045	1.018, 1.072	0.001
Model 4	1.041	1.009, 1.074	0.011
Model 5	1.059	1.019, 1.101	0.004

Model 1: univariate logistic regression analysis;

Model 2: adjusted for age, sex;

Model 3: adjusted for age, sex, albumin.

Model 4: adjusted for age, sex, albumin calcium, phosphorus.

Model 5: adjusted for age, sex, albumin, calcium, phosphorus, 25(OH)D, serum creatinine, pathological diagnosis.

^aThe upper normal limit of serum PTH (68.3 pg/ml) is used as one unit to calculate the odds ratio for low body weight per doubling of serum PTH.