The same happens with different odds ratio in CATPA (odds ratio = 34.
When all variables are present in the model, neither gender nor age nor their interactions increase the probability of clinical ADHD, due to the logical presence of CATPA, CATPRO, CATPAOPR or CATPA&PR.
The same holds for CATPA and CATPR, although to a lesser extent.
In our study we also observed that the prevalence in CATPA&PR, CATPA, CATPR or CATPAOPR is higher in each age group than the prevalence of clinical ADHD.
Regarding the criterion validity and clinical usefulness of ADHD RS-IV, the best results are observed in the CATPA&PR procedure, with respect to CATPA, CATPR and CATPAOPR since it classifies both healthy and ADHD subjects in the three age groups better than the other procedures ,it is the best diagnostic procedure because of its high specificity, it shows greater clinical usefulness and a positive result of disorder in CATPA&PR presents an odds ratio for clinical ADHD higher than the rest of the alternatives.
The second option with better psychometric characteristics is CATPA because of its ability to classify ADHD, high specificity in the three age groups and its clinical utility indicators.
An interesting reflection in this section is that expressed by Willcutt (2012), suggesting that the correct algorithm regarding the use of CATPA&PR, CATPA, CATPR or CATPAOPR would be purpose-specific, considering the greater or lesser need for sensitivity, specificity or clinical usefulness of the test.