Table 2.

Data of the primary osteons’ vascular canals, Haversian canals and secondary osteons in adult male rats subchronic exposed to 5 mg of Na₂SeO₃/L in drinking water for 90 days (Se group) and control rats

	Group	N	Area (μm2)	Perimeter (μm)	Max. diameter (μm)	Min. diameter (μm)
Primary osteons’ vascular canals	Control	218	397.3 ± 98.1	72.29 ± 8.95	12.89 ± 2.08	9.83 ± 1.58
	Se	203	459.6 ± 127.5	77.93 ± 11.11	14.08 ± 2.58	10.36 ± 1.51
	T-test		P < 0.05	P < 0.05	P < 0.05	P < 0.05
Haversian canals	Control	208	426.9 ± 119.2	74.47 ± 10.25	13.21 ± 2.16	10.24 ± 1.73
	Se	203	375.5 ± 67.4	70.29 ± 6.58	12.49 ± 1.68	9.64 ± 1.28
	T-test		P < 0.05	P < 0.05	P < 0.05	P < 0.05
Secondary osteons	Control	208	6541.0 ± 2012.6	291.79 ± 43.09	52.21 ± 8.61	39.38 ± 7.52
	Se	203	5766.7 ± 1539.2	272.16 ± 35.81	47.80 ± 7.06	37.99 ± 6.24
	T-test		P < 0.05	P < 0.05	P < 0.05	P < 0.05

N: number of measured structures.