This questionnaire was designed by Wijma in 2002 to measure FOC [31]. DFS is a self-assessed questionnaire consisting of 10 questions with five items having positive meaning [1, 3, 5, 7, 10] and the remaining five items having negative meaning [2, 4, 6, 8, 9]. The questions are scored based on a 10-point Likert scale ranging from (Strongly disagree = 1 to strongly agree = 10). The positive items are scored in reverse. The possible score range is from 10 to 100 that is calculated by summing up the total scores of the questionnaire. Higher scores indicate greater FOC. This scale has an acceptable reliability (α = 88 %) [25].
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