The results of Pearson correlation coefficient indicated that There was a high correlation between digital and harpenden calipers as well (R=0.898, P= 0.000). The Results of repeated-measures ANOVA and Bonferroni post hoc test indicated that there were significant difference between harpenden and plastic calipers (P=0.045) and between digital and plastic calipers (P=0.003). Measurements were performed from 3 points (the triceps, iliac and femoral). They were randomly placed in one of the four different conditions (Digital, Harpenden, Plastic Calipers and Electrical Bioimpedance) on 4 separate days, in a crossover design for estimating fat percentage. For this purpose, 30 inactive female students of Shahid Rajaei University (Age=20.93☑.91 Height=164.73±4.57cm Weight=56.65☘.02 Kg) were selected voluntarily. The aim of this study was to compare and validate the selected methods for estimating fat percentage. Therefore, it is recommended that the Iranian slim guide skinfold caliper made in-house can be used for anthropometric measurements, especially in measurements that last more than one day, which is considered an accurate tool with an acceptable level of validity. Also, a significant value was acceptable in all tests (P≤ 0.001). Also, the validity of this method in all seven points was a mean of r = 0.98-0.97 on two days, indicating an acceptable level of validity. Good inter-examiner reliability (ICC = 0.93-0.93) was found for the slim guide skinfold caliper for two days. Examiners 1 and 2 demonstrated Good intra-examiner reliability, with high ICC values (ICC=0.95-0.96 and ICC=0.96-0.97 respectively) as a mean of the seven points per day. Also, to assess the validity of the slim guide skinfold caliper, the results of subcutaneous fat measurement using the slim guide skinfold caliper were compared with those of subcutaneous fat measurement using the Harpenden skinfold caliper, which is considered a gold standard method for skinfold measurement.
The seven-point subcutaneous fat was measured to evaluate the reproducibility of the slim guide skinfold caliper on 2 different days according to Heyward and Wagner's instructions.
A total of 15 healthy subjects who met inclusion/exclusion criteria were included in the study. The aim of this study was to evaluate the reliability and validity of the Iranian slim guide skinfold caliper and the Harpenden skinfold caliper to measure subcutaneous fat.
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