2.2. Sample Size Calculation

To determine the study sample size, we considered that >95% of the general population would present a high level of knowledge regarding COVID-19, evidenced by a recent study conducted in Oman evaluating the level of KAP toward COVID-19 in the 6 months preceding this study by the NCSI [15]. Therefore, based on the above study results, our study sample size was calculated as 2134 and set to be 3000 with a 3% margin of error and 95% CI. Forty-one thousand phone numbers from the entire country were selected randomly as a sample frame. Around 12,000 calls were made to reach the desired sample size of 3000 participants. Around 9000 calls were excluded from the study due to many reasons, such as no response, a busy signal, hanging up in the middle of the interview, unqualified respondents <18 years, and respondents who did not understand the language.