Clinical significance of retrograde inferior parathyroid protection technique based on thymus preservation in thyroid surgery

Table 4 PTH level and serum calcium level among patients with different IPG types of orthotopic retention

Variable	IPG types of orthotopic retention			F value	P value
Variable	Type A	Type B	Type C	F value	P value
PTH (pre-operation)	3.64 ± 1.07	4.33 ± 1.61	3.88 ± 0.90	1.577	0.204
PTH (1 days after surgery)	3.35 ± 1.38	3.44 ± 1.44	3.30 ± 0.88	0.138	0.937
PTH (2 months after surgery)	3.83 ± 1.08	3.87 ± 1.21	3.68 ± 1.20	0.074	0.974
PTH (6 months after surgery)	4.04 ± 1.28	4.24 ± 1.53	4.38 ± 1.94	0.203	0.894
Ca (pre-operation)	2.34 ± 0.06	2.36 ± 0.07	2.31 ± 0.08	1.339	0.270
Ca (1 days after surgery)	2.19 ± 0.10	2.23 ± 0.10	2.20 ± 0.08	1.136	0.342
Ca (2 months after surgery)	2.38 ± 0.10	2.40 ± 0.12	2.40 ± 0.11	0.306	0.821
Ca (6 months after surgery)	2.35 ± 0.12	2.39 ± 0.10	2.37 ± 0.07	0.641	0.591

Note Measurement unit for PTH level and serum calcium level is pmol/L, mmol/L respectively

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