The FABQ is a self-report questionnaire with 16 items (each scored 0 to 6) covering both work and physical activity [17]. It is a valid and reliable (Cronbach’s alpha = 0.88 for work and 0.77 for physical activity, ICC for test-reliability = 0.74) tool to assess disability in patients with LBP [17]. The FABQ was translated and cross-culturally adapted into a Thai version and was reported as a valid and reliable tool (n = 129, Cronbach’s alpha range 0.87–0.88, ICC2,1 = 0.986) [18].
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