Data analysis
Data were entered in Microsoft excel and the same was analyzed using a
statistical package for social sciences SPSS version 20.0 (IBM
Corporation, Armonk, NY, USA). Statistical comparisons were made using
percentile and mean differences. Descriptive statistics calculated for
background variables. Since the data do not follow a normal
distribution, the Kruskal Wallis test (Non-parametric) was performed to
determine the association between the concentration of salbutamol and
other background characteristics. Statistical significance was set at a
p-value ≤ of 0.05.