However, the mean postoperative calcium in the gasless RATH group (2.09 ± 0.08 mmol/L) was significantly lower than that in the CH group (2.11 ± 0.09 mmol/L, P = 0.018), and the mean postoperative PTH of the gasless RATH group (31.1 ± 9.5 pg/mL) was significantly more than that in the CH group (27.4 ± 10.0 pg/mL, P = 0.006). Here, PTH is linked to cyclic hematopoiesis.