1. Volume 100, Issue 6, Pages 1028-1036 (June 2006)
Development of chronic hypoventilation in amyotrophic lateral sclerosis patients 
Daniele Lo Coco, Santino Marchese, Salvatore Corrao, Maria Cettina Pesco, Vincenzo La Bella, Federico Piccoli, Albino Lo Coco 
Respiratory Medicine 
Volume 100, Issue 6, Pages (June 2006)
DOI: /j.rmed
Copyright © 2005 Elsevier Ltd Terms and Conditions

2. Figure 1
Relationship between the absence of chronic hypoventilation (CH) and the time from study entry in the whole group of patients. Kaplan–Meier curve depicts the proportion of patients without CH according to the time since study entry (initial number of patients: 38).
Respiratory Medicine  , DOI: ( /j.rmed )
Copyright © 2005 Elsevier Ltd Terms and Conditions

3. Figure 2
Relationship between the Appel ALS Rating Scale (AARS) category, the absence of chronic hypoventilation (CH) and the time from study entry. Kaplan–Meier curves depict the proportion of patients without CH according to the time since study entry. The patients (38) are grouped with respect to their AARS category (R=rapid progression, n:14; I=intermediate progression, n:10; S=slow progression, n:14). CH-free survival differed significantly among the three groups (P< by the Log-Rank test).
Respiratory Medicine  , DOI: ( /j.rmed )
Copyright © 2005 Elsevier Ltd Terms and Conditions