TABLE 3.

Comparative model fits for participation in vigorous exercise (VE) and age as moderators of BMI¹

	Model fit		Comparative model fit
Model	−2LL	df	Δ−2LL	df	P value	Test
1: Full model	18,356.58	7060
2: No VE moderation	18,426.50	7063	69.92	3	<0.001	2 vs 1
2a: No additive genetic moderation	18,376.40	7061	19.82	1	<0.001	2a vs 1
2b: No shared environmental moderation	18,357.25	7061	0.67	1	0.42	2b vs 1
2c: No nonshared moderation	18,360.89	7061	4.31	1	0.04	2c vs 1
3: No age moderation	18,367.97	7063	11.39	3	<0.001	3 vs 1
3a: No additive genetic moderation	18,362.08	7061	5.50	1	0.02	3a vs 1
3b: No shared environmental moderation	18,360.94	7061	4.36	1	0.04	3b vs 1
3c: No nonshared moderation	18,358.24	7061	1.66	1	0.20	3c vs 1

¹n = 8627 study participants drawn from 2710 monozygotic and 2327 dizygotic twin pairs (results of gene × environment interaction twin structural equation modeling).