Table 1: Comparison of demographic variables between respiratory groups.

VariableIntact respirationImpaired respirationP value

Age (yrs)55.9 (11.9)59.7 (11.1)0.28
Education (yrs)14.6 (2.62)14.2 (2.12)0.55
ALSFRS-R total score41.7 (5.24)37.8 (8.22)0.12
Gender (% Male)11 (55.0%)11 (45.8%)0.55
Race (%)
 Caucasian17 (85.0%)20 (83.3%)0.67
 Hispanic1 (5.00%)2 (8.30%)
 African American2 (10.0%)1 (4.20%)
 Other1 (4.20%)
Site of onset (%)
 Bulbar6 (30.0%)8 (33.3%)0.81
 Limb14 (70.0%)16 (66.7%)

Note: mean (SD) and frequencies (%) are given for each variable. t-tests and chi-squares were calculated for continuous (age, education, and ALS-FRS-R) and categorical variables (gender, race, and site of onset), respectively. Abbreviations are as follows: ALSFRS-R: amyotrophic lateral sclerosis functional rating scale-revised.