Table 1.

Comparison between accurate scans positive in the early phase only versus the late phase only

Variable	Late positive only (n = 170)	Early positive only (n = 190)	P value
Age, y (range)	60 (10–89)	63 (19–89)	.028
Females (%)	126 (74)	150 (79)	.34
Preop Ca (mg/dL)	11.1 ± 0.1	11.0 ± 0.1	.03
Preop PTH (pg/mL)	137 ± 9	117 ± 7	.07
Preop phosphate (mg/dL)	3.1 ± 0.2	2.9 ± 0.0	.45
Postop Ca (mg/dL)	9.4 ± 0.0	9.4 ± 0.0	.22
Postop PTH (pg/mL)	48 63	45 ± 2	.47
Gland weight (mg)	902 ± 131	533 ± 55	.009
Cure (%)	169 (99%)	187 (98%)	.63
Recurrence (%)	2 (1.2%)	4 (2.1%)	.69

Continuous variables are represented as the mean ± standard error of the mean unless otherwise indicated.

Ca = calcium; Preop = preoperative; Postop = postoperative; PTH = parathyroid hormone.