“…By comparison, bulbar weakness was a significant predictor of respiratory failure in several studies ( Malaga et al, 2021 ; Kanikannan et al, 2014 ; Toamad et al, 2015 ; Wu et al, 2015 ; Green, Baker & Subramaniam, 2018 ; Islam et al, 2019 ; Umer et al, 2019 ; Luo et al, 2020 ; Ning et al, 2020 ). Although the short time from symptom onset to admission (≤7 days) was a significant predictor in several studies ( Rantala et al, 1995 ; Toamad et al, 2015 ; Wu et al, 2015 ; Green, Baker & Subramaniam, 2018 ; Umer et al, 2019 ; Luo et al, 2020 ), it did not reach statistical significance in our univariate and multivariate analyses. This may be because our hospital is a tertiary hospital, and some patients were referred from community hospitals, so our hospital admission date may not be the date of initial hospital admission.…”