The internal consistency reliability of each question was calculated. The internal consistency reliability involves the relationship of the items in a test. It is used in psychometrics to ensure that all test items measure the same variable. Internal consistency is measured in Cronbach’s alpha coefficients that range from 0 – 1. The Cronbach’s alpha measures the overall correlation between items within a scale. The higher the coefficient value, the higher the reliability and the lower the standard error of measurement (8). Reliability is considered
acceptable for group comparisons when coefficient exceeds Nunnally’s criterion 0.7 (9). The data
were analyzed using SPSS software (version 11.5; SPSS, Chicago, Illinois).