Table 1 Prognostic factors according to Cox multivariate analysis.

		Increased risk of death	p Value
FVC <80% at diagnosis	No	1	0.0004
	Yes	4.11
PEG	Yes	1	0.0006
	No	3.38
Age groups (years)	⩽50	1	0.004
	51–60	1.40
	61–70	1.95
	>70	2.72
Attending a tertiary centre for ALS	Yes	1	0.006
	No	1.61
Bulbar onset	No	1	0.009
	Yes	1.45
Riluzole treatment	Yes	1	0.05
	No	1.31

The other variables that were included, but did not show significant results, were sex, delay in diagnosis and non‐invasive positive‐pressure ventilation. Riluzole treatment, percutaneous endoscopic gastronomy (PEG) and non‐invasive ventilation were included as time‐dependent variables.

ALS, amyotrophic lateral sclerosis; FVC, forced vital capacity.