In comparing demographic groups association with knowledge level, a significant difference was found among age groups, nature of housing groups, nationality, age group of children (p value 0.002, 0.011,0.031,0.004 respectively). On the other hand, no significant differences were found among educational level, region of residency, place of residency, work status, family income (p values 0.328, 0.411, 0.739, 0.979, 0.078 respectively).