Hospitalizations due to respiratory failure in patients with Amyotrophic Lateral Sclerosis and their impact on survival: a population-based cohort study

Table 1 Number and distribution of patients with ALS by selected characteristics and hospitalizations after the diagnosis of ALS

^aChi square test p comparing proportions between patients with bulbar, spinal and unknown site of onset
^bExcludes one patient who did not have any hospitalization after the diagnosis of ALS and four patients who died during the hospitalization in which the diagnosis of ALS was made
^cAt least one hospitalization after the diagnosis of ALS with discharge code for respiratory failure (ICD-9-CM codes 518.81, 518.82, 518.83, 518.84) in any position
^dSubtotal of patients with at least one hospitalization with discharge code for respiratory failure
^eSubtotal of patients with at least one hospitalization with discharge code for acute respiratory failure
^fDead or alive at the end of follow up, December 31, 2011
^gThe denominator of percentages is the total number of deceased patients

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