Table 4.

Sub-group analysis of bone mineral density in patients with and without ICR groups.

	With ICR		Without ICR		P-valuea
	mean	range	mean	range
Z score
Total	0.074	−1.6∼2.8	0.468	−2.0∼3.1	0.135
Male	0.633	−0.9∼2.8	−0.050	−1.4∼1.3	0.723
Female	0.031	−1.6∼1.7	0.513	−2.0∼3.1	0.063
<30 years old	−0.189	−1.6∼2.8	−0.092	−2.0∼1.5	0.819
≧ 30 years old	0.271	−1.3∼1.7	0.985	−0.8∼3.1	0.017∗
T score
Total	−0.026	−2.8∼2.8	0.160	−2.0∼2.4	0.503
<30 years old	−0.156	−1.5∼2.8	−0.050	−2.0∼1.6	0.807
≧ 30 years old	0.071	−2.8∼1.6	0.354	−1.5∼2.4	0.442

^aP-values based on the one-way analysis of variance (ANOVA).

∗ = statistically significant.

Abbreviations: ICR, idiopathic condylar resorption.