Spss software statistical computer package version 22

The collected data was organized and statistically analysed using SPSS software statistical computer package version 22 (SPSS Inc., USA). The mean and standard deviation (SD) were calculated. One-way ANOVA was used to test the difference about mean values of measured variables between groups. Multiple comparisons between pairs of groups were performed using Tukey HSD (Post hoc range test). Significance was adopted at P < 0.05 for interpretation of results of tests of significance (Azzubaidi et al., 2013 ).

The collected data were arranged, tabulated and statistically analyzed using SPSS software statistical computer package version 22 (SPSS Inc, USA). Normally distributed quantitative data were displayed as the mean and standard deviation (SD). One-way ANOVA was used in comparing between the three groups. Pairwise comparison was done using Post hoc Tukey’s test. However not- normally distributed data were expressed as median and interquartile range (IQR) and Kruskal–Wallis test was used as a test of significance Pearson or Spearman correlation was used to recognize relation between AL and study parameters. Linear regression analysis was done to identify the value of AL in predicting other study parameters. For explanation of results of tests of significance, significance was assumed at P ≤ 0.05.