Table 4 Relation between mortality, hospitalizations for respiratory failure and clinical characteristics. Hazard Ratio (HR), with 95 % Confidence Interval (95 % CI)

 No^b

1.00

- -

1.00

- -

 Yes

<0.0001

3.52

2.65; 4.67

<0.0001

4.00

3.00; 5.34

 Spinal^b

1.00

- -

1.00

- -

 Bulbar

0.0005

1.71

1.27; 2.32

0.0791

1.32

0.97; 1.81

 Missing

0.0084

1.69

1.14; 2.49

0.2113

1.31

0.86; 2.01

  < 68^b

1.00

- -

1.00

- -

  ≥ 68

<0.0001

2.05

1.56; 2.69

<0.0001

2.50

1.86; 3.36

  ≥ median^{b, c}

1.00

- -

1.00

- -

  < median^c

0.0065

1.81

1.18; 2.77

0.0004

2.23

1.43; 3.47

 Unknown

0.1095

1.34

0.94; 1.91

0.0459

1.48

1.01; 2.19