Variable	βj	Imputed valuesa
General appearance	0.711	1.144
Wheezing	0.946	0.558
Rales/rhonchi	1.099	0.507
Retractions	1.383	0.691
Cyanosis	0.784	0.050
Lethargy	0.520	0.190
Poor air movement	0.631	0.134
Worst room air SaO2	-0.079	90.209
Maximum respiratory rate	0.036	58.036

^aimputed values were defined as the mean value calculated from all subjects