Comparison of Initial Clinical Presentations between Primary Hyperparathyroidism Patients from New Brunswick and Changsha

Table 4

Simple linear regression and multiple linear regression of relation adjusted for age and BMI (partial correlation coefficients) between serum iPTH and other variables in patients with primary hyperparathyroidism in Changsha and New Brunswick and all patients in the two cities.

Serum PTH (pg/mL)	Simple linear regression			Multiple linear regression
	Changsha ()	New Brunswick ()	Total ()	Changsha ()	New Brunswick ()	Total ()
Age (years)	−0.29^b	0.03	−0.21^b	−0.01	0.04	−0.04
Duration (years)	0.03	−0.03	0.01	0.08	−0.01	0.01
BMI (kg/m^2)	−0.28^b	0.02	−0.45^a	−0.14	0.01	−0.06
Ca (mg/dL)	0.43^a	0.13^c	0.54^a	0.44^a	0.23^b	0.50^a
25 (OH) D (ng/mL)	−0.25^c	−0.20^c	−0.53^a	−0.15	−0.14	−0.11^c
AKP (U/L)	0.69^a	0.23^b	0.60^a	0.59^a	0.34^a	0.63^a
Cr (mg/dL)	0.22^c	0.01	0.11	0.11	0.01	0.08

PTH: parathyroid hormone; BMI: body mass index; Ca: serum calcium; Cr: creatinine; 25 (OH) D: 25-hydroxyvitamin D; AKP: alkaline phosphatase. Data are presented as : , , and .