In addition, the median (inter-quartile range) for attained knowledge score were 11 (10–12). So, a score below 11 was considered low and a score equal to or greater than 11 was high [21]. Similarly, a score of 78 (74–80) and 6 (5–7) were used to stratify the composite scores of attitude and perception on what constitute occupational hazards in the workplace into positive and negative, good and poor categories, respectively.