Table 4. Comparisons of meniscal T2 values among three age groups and two gender groups after adjusting for the BMI effect in multiple linear regression analysis with GEE.

			95%		Wald
Parameters	B	SE	Confidence	Interval	Chi-square	P-value
BMI	0.052	0.042	–0.029	0.134	1.578	0.209
Sex (M vs. W)	–0.878	0.266	–1.399	–0.358	10.926	0.001
Group 3 vs. Group 1*	1.777	0.473	0.850	2.704	14.117	<0.001
Group 2 vs. Group 1*	0.741	0.434	–0.109	1.591	2.920	0.088
Sex (M)×Group 3	–0.109	0.544	–1.176	0.958	0.040	0.841
Sex (M)×Group 2	–0.313	0.504	–1.301	0.676	0.385	0.535

^*Group 1∶ 20Age34; Group 2∶ 35Age49; Group 3∶ 50Age70 (Group 1 is the reference group).

Sex (M: Men; W: Women [the reference group]).

Abbreviations: BMI, body mass index; B, regression coefficient; SE, standard error.