**2.14 Statistical analysis**

Data analysis was done using SPSS package, and the storage was in Microsoft excel. Data are expressed in tabular, bar chart and prose forms. Mean standard deviation and percentages of all data were derived. Odd ratio was used to measure strength of association between ROD and their relative risk.

The t-test and chi-squared test were used to determine the differences in means of the CRF group and control.

P value of less than 0.05 was regarded as significant.
