Association between body fat decrease during the first year after diagnosis and the prognosis of idiopathic pulmonary fibrosis: CT-based body composition analysis

Table 2 Spearman correlation analysis of changes in CT-derived parameters with changes in weight, body mass index (BMI), and pulmonary function test results

	Weight change		BMI change		FVC decline (% predicted)		DL_CO decline (% predicted)
	r	P value	r	P value	r	P value	r	P value
Change in the fat area at T12-L1 during the first year post-diagnosis (cm²)	0.328	< 0.001	0.335	< 0.001	0.122	0.032	0.036	0.527
Change in muscle area at T12-L1 during the first year post-diagnosis (cm²)	0.314	< 0.001	0.301	< 0.001	-0.022	0.704	0.008	0.887

r: Spearman correlation coefficients; BMI: body mass index; FVC: forced vital capacity; DL_CO: diffusing capacity of carbon monoxide

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