B. Ley, H. R. Collard, T. E. King, and J. , Clinical course and prediction of survival in idiopathic pulmonary fibrosis, Am J Respir Crit Care Med, vol.183, issue.4, pp.431-471, 2011.

G. Raghu, H. R. Collard, J. J. Egan, F. J. Martinez, J. Behr et al., An official

A. Statement, idiopathic pulmonary fibrosis: evidence-based guidelines for diagnosis and management, Am J Respir Crit Care Med, vol.183, issue.6, pp.788-824, 2011.

M. J. Strand, D. Sprunger, G. P. Cosgrove, E. R. Fernandez-perez, S. K. Frankel et al.,

G. Raghu, V. C. Amatto, J. Behr, and S. Stowasser, Comorbidities in idiopathic pulmonary fibrosis patients: a systematic literature review, Eur Respir J, vol.46, issue.4, pp.1113-1143, 2015.

E. Chailleux, J. P. Laaban, and D. Veale, Prognostic value of nutritional depletion in patients with COPD treated by long-term oxygen therapy: data from the ANTADIR observatory, Chest, vol.123, issue.5, pp.1460-1466, 2003.

C. Landbo, E. Prescott, P. Lange, J. Vestbo, and T. P. Almdal, Prognostic value of nutritional status in chronic obstructive pulmonary disease, Am J Respir Crit Care Med, vol.160, issue.6, pp.1856-61, 1999.

A. M. Schols, R. Broekhuizen, C. A. Weling-scheepers, and E. F. Wouters, Body composition and mortality in chronic obstructive pulmonary disease, Am J Clin Nutr, vol.82, issue.1, pp.53-62, 2005.

J. Vestbo, E. Prescott, T. Almdal, M. Dahl, B. G. Nordestgaard et al., Body mass, fat-free body mass, and prognosis in patients with chronic obstructive pulmonary disease from a random population sample: findings from the Copenhagen City Heart Study

, Am J Respir Crit Care Med, vol.173, issue.1, pp.79-83, 2006.

R. Thibault, L. Gallic, E. Picard-kossovsky, M. Darmaun, D. Chambellan et al., Assessment of nutritional status and body composition in patients with COPD: comparison of several methods, Rev Mal Respir, vol.27, issue.7, pp.693-702, 2010.

B. R. Celli, M. Decramer, J. A. Wedzicha, K. C. Wilson, A. Agusti et al., An official American Thoracic Society/European Respiratory Society statement: research questions in COPD, Eur Respir J, vol.45, issue.4, pp.879-905, 2015.
URL : https://hal.archives-ouvertes.fr/hal-01756210

U. G. Kyle, I. Bosaeus, D. Lorenzo, A. D. Deurenberg, P. Elia et al.,

, Bioelectrical impedance analysis--part I: review of principles and methods, Clin Nutr, vol.23, issue.5, pp.1226-1269, 2004.

U. G. Kyle, I. Bosaeus, D. Lorenzo, A. D. Deurenberg, P. et al.,

, Bioelectrical impedance analysis-part II: utilization in clinical practice, Clin Nutr, vol.23, issue.6, pp.1430-53, 2004.

R. Thibault, L. Genton, and C. Pichard, Body composition: why, when and for who?, Clin Nutr, vol.31, issue.4, pp.435-482, 2012.

, Global Initiative for Chronic Obstructive Lung Disease. Global strategy for the diagnosis, management and prevention of chronic obstructive lung disease, 2017.

M. Alakhras, P. A. Decker, H. F. Nadrous, M. Collazo-clavell, and J. H. Ryu, Body mass index and mortality in patients with idiopathic pulmonary fibrosis, Chest, vol.131, issue.5, pp.1448-53, 2007.

T. Kishaba, H. Nagano, Y. Nei, and S. Yamashiro, Body mass index-percent forced vital capacity-respiratory hospitalization: new staging for idiopathic pulmonary fibrosis patients, J Thorac Dis, vol.8, issue.12, pp.3596-604, 2016.

O. Nishiyama, R. Yamazaki, H. Sano, T. Iwanaga, Y. Higashimoto et al.,

, Quantitative variables: mean ± standard deviation (min; Q1; median ; Q3; max). FFMI, fat-free mass index, Qualitative variables: number (%)

, MAMC, mid-arm muscular circumference; SEFI®, Simplified Evaluation of Food Intake®

, TSF, triceps skinfold thickness. Missing data: serum 9 transthyretin, p.3