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Table 7 Evidences that supports construct validity

From: Development of an inventory to assess perceived barriers related to PKU treatment

VariablesPhenylketonuria Perceived Barrier to Treatment Inventory (Score)
Kendall’s tau-b test (p)
Phe at diagnosis (n = 23)0.49 (0.749)
Recent Phe (n = 22)a0.40 (0.011)
Recent Median Phe (n = 22)a0.41 (0.010)
Disease knowledge -VAS (n = 23)- 0.10 (0.522)
Dietary knowledge -VAS (n = 23)0.03 (0.873)
Perceived adherence -VAS (n = 23)- 0.31 (0.043)
Full Scale IQ (n = 19)b- 0.23 (0.179)
Verbal IQ (n = 19) b- 0.13 (0.437)
Performance IQ (n = 19)b- 0.28 (0.104)
  1. Notes. Phe Phenylalanine. Recent Median Phe = median of the last 12 months Phe measures prior to the study
  2. a One patient had no information regarding recent adherence. bFour patients did not answer WASI
  3. Statistic significances are printed in bold font