نمونه ترجمه تخصصی روایابی درباره روایی محتوا و پایایی پرسشنامه

Content validity and reliability of questionnaire

Validity of a tool stands for the extent to which a construct is measured by the tool. Validity is a spectrum starting from 0 (none) to 100% (all). No tool is completely valid, and instead of determining validity or invalidity, researchers try to determine validity level. Validity varies from sample to sample and situation to situation. Rather than supporting validity of a tool, validity test, in fact, tells us if a specific tool is valid in a specific group and for a specific purpose. That means, a tool can be valid in one situation and invalid in another [13]. To test scientific validity of the primary questionnaire, face validity and content validity methods were used with a panel of expert. Face validity Face validity indicates the extent of validity of the appearance of a tool or the extent that the appearance of a tool (according to the respondents) mirrors the construct that is meant to be measured [12, 13]. Face validity is a subjective judgement that is made by researchers or potential subjects. It is considered as one of the least important measures as it is subjective; still it is a key aspect of validity [13]. A qualitative method was used to determine face validity. That is, along with observing grammatical and layout standards, professors in health and nursing department were consulted. Then the tool was provided to 10 diabetic patients for feedback on the content, clarity, and understandability. Content validity One of the most important parts of validity assessment task is content validity assessment. By content validity we refer to relevance of the content with the objective of study and the question “if the tool measures the expected objective?” [16]. In other words, the aim of content validity is to make sure of the capability of the tool to measure a phenomenon (or a concept) that is intended to be measured [12]. Content validity is usually determined by a panel of experts of seven or more members. Taking into account complicacy of the nature of behavior, a combined panel of experts in health sciences were consulted to achieve comprehensive and clearer results [17]. To examine content validity, content validity index (CVI) and content validity ratio (CVR) were used. To this end, the primary questionnaire was provided to 10 experts in health education, health promotion, and nursing education and the feedback were implemented in the questionnaire.