Hill et al. [5] developed a 59-item PI in order to combine and capture the core structures of FMPS and HMPS. Subjects are asked to respond on a 5-point scale from strongly disagree to strongly agree. The PI consisted of 8 subscales including Concern over Mistakes (CM) (e.g., “To me, a mistake equals failure”), Need for Approval (NA) (e.g., “I am over-sensitive to the comments of others”), Rumination (Ru) (e.g., “If I make a mistake, my whole day is ruined”), High Standards for Others (HSO) (e.g., “I’m often critical of others”), Perceived Parental Pressure (PPP) (e.g., “My parents are difficult to please”,) Organization (Or) (e.g., “I like to always be organized and disciplined”), Planfulness (Pl) (e.g., “I find myself planning many of my decisions”), and Striving for Excellence (SE) (e.g., “I have to be the best in every assignment I do”). The exploratory principal components analysis resulted in a two higher order factor solution called “Conscientious Perfectionism” (based on Or, SE, Pl, and HSO) and “Evaluative Perfectionism” (based on CM, Ru, NA, and PPC). Jamshidi et al. [31] reported satisfactory structural validity, convergent validity, and internal consistency of the Persian version of PI. As illustrated in the results section, Table Table2,2, all subscales of the PI showed acceptable to good McDonald's Omega coefficient. The PI can be seen in Additional file 1.

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