2.4.2.2 Validity: Construct validiy
Convergent validity (CgV) is considered subcategories of construct validity (CsV). Convergent validity was determined by performing the Spearman correlation analysis between Tr-PEESS v2.0 scores and Tr-PedsQLTM 3.0 EoE Module Total, Symptoms Total, Symptoms I, Symptoms II score. The level of correlation coefficients were regarded as follows: r ≥ 0.81–1.0 as excellent, 0.61–0.80 very good, 0.41–0.60 good, 0.21–0.40 fair, and 0–0.20 poor.17 The negative correlation coefficients above 0.4 (19, 20) between Tr-PEESS v2.0 scores and Tr-PedsQLTM 3.0 EoE Module Total, Symptoms Total, Symptoms I, Symptoms II scores are supportive of CgV. Divergent validity (DgV) confirms that a measurement tool or test has a low or no relationship with variables it is not intended to measure, thus establishing the test’s ability to discriminate between different and independent concepts.19, 20 The lack or low correlation between the dimensions of communication and food feeling of Tr-PedsQLTM 3.0 EoE Module with Tr-PEESS v2.0 has also been used to test DgV.