Comparison of neurohormone and callus volume formation in long bone fractures associated with or without traumatic brain injury

Table 1 Biochemical marker parathyroid hormone over time in patients with and without traumatic brain injury

PTH (pg/mL)	Group	n	mean ± SD	Statistic (test type)	P value	Significance
7 days	Without TBI	25	7.2 ±3.0	t = -9.05 (t-test)	< 0.0001	Significant
	With TBI	16	42.0 ± 15.2
6 weeks	Without TBI	25	15.8 ± 5.5	U = 175 (Mann-Whitney)	0.51	Non-significant
	With TBI	16	305.2 ± 500.3
12 weeks	Without TBI	25	8.9 ± 4.0	t = -5.25 (t-test)	< 0.0001	Significant
	With TBI	16	38.2 ± 22.1

PTH: Parathyroid hormone; TBI: Traumatic brain injury.