Determination of the Validity and Reliability of a Modified Osteoporosis Health Belief Scale and Osteoporosis Self-Efficacy Scale to Include Vitamin D

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Human and Clinical Nutrition | Life Sciences | Nutrition


Background/Purpose: Osteoporosis health beliefs and osteoporosis self-efficacy scales are commonly used in determining educational needs towards osteoporosis prevention but lack vitamin D content. This study examined the validity and reliability of Osteoporosis Health Belief Scale (OHBS) and Osteoporosis Self Efficacy Scale (OSES) modified scales which included vitamin D content in order to be used in studies to increase vitamin D and calcium intakes for prevention of osteoporosis.
Methods: Participants were a convenience sample of 153 college-aged adults at a Midwestern university. Factor analysis, Cronbach α, and Intra-class correlation coefficients determined validity, internal consistency, and test-retest reliability of the modified scales.
Results: The OHBS-D Cronbach α was r = .82; subscales ranged from .75-.87. The OSES-D Cronbach α was r = .98; subscales ranged from .96-.98. Total ICC for OHBS-D and OSES-D was .79 and .97 respectively. Factor analysis extracted eight factors for the OHBS-D and three factors for the OSES-D, which explained 52.2% and 82.2% of the total variance in all variables accounted for by each factor respectively.
Conclusion: The modified scales were valid and reliable indicating they could be used to determine osteoporosis related health beliefs and self-efficacy.