Table 1. Patient demographics.

Variable	Group A, 2001–2007 (n = 16 patients)	Group B, 2008–2014 (n = 24 patients)	P value
Age, y (median [range])	19 [10–23]	19 [10–24]	.79
Sex			1.00
Male	6 (37.5%)	9 (37.5%)
Female	10 (62.5%)	15 (62.5%)
Positive family history*	4 (25%)	8 (33.3%)	.73
Preoperative calcium (mg/dL; mean ± SEM)	11.8 ± .3	11.5 ± .2	.50
Preoperative PTH (pg/mL; mean ± SEM)	118 ± 21	187 ± 46	.18

PTH = parathyroid hormone; SEM = standard error of the mean.

^*Family history includes multiple endocrine neoplasia type I and familial hyperparathyroidism.