Bone density of the axis (C2) measured using Hounsfield units of computed tomography

Table 3 Bone density values in mg/cm³ of C2 of different age groups

Age group	N	Mean (mg/cm³)	Median (mg/cm³)	Standard deviation	Minimum	Maximum
10–19 years	16	272.63	271.08	50.27	201.26	411.18
20–29 years	25	253.54	241.26	51.51	185.40	364.56
30–39 years	36	260.78	253.92	62.06	126.47	392.01
40–49 years	25	267.00	245.75	73.81	145.88	447.16
50–59 years	39	228.28	221.14	62.67	126.95	483.84
60–69 years	28	212.17	212.74	54.76	131.68	337.11
70–79 years	17	186.92	187.06	54.87	103.99	305.87
80–89 years	12	182.66	176.17	54.34	117.95	265.63
Total	198	237.26	228.48	65.54	103.99	483.84

N number of cases
Significant decrease in bone density in paired comparisons of age groups below 50 years with those above 50 years (p < 0.001)

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