We thus considered that 16 PF measured a healthy personality, and the combination of the different traits is what can give a categorization of disease. 3 Cattell, Eber and Tatsuoka established the fact that the instrument possessed suitable predictive ability with respect to the criterion of daily life. They supported this statement through intertwined research conducted by them over a 25 year span. Moreover, there are specific norms for Mexico. We have satisfactorily used these norms for 16 years at the Iztacala Psychological Evaluation Unit. In the last five years we have used them in the assessment of students applying for admission to the Orthodontics and Endodontics and periodontal dental Specialties offered at the FES Higher Education School Iztacala. For two years these norms have equally been applied to candidates for admission at different specialties offered by the National Pediatrics Institute. The norms have proven to exhibit a suitable predictive power.
3 Cattell, Eber y Tatsuoka establecen que el instrumento tiene buena capacidad predictiva en relación con el criterio de la vida diaria, apoyando esta aseveración en investigaciones entrelazadas a través de 25 años; además, existen normas para México que nosotros hemos empleado satisfactoriamente a lo largo de 16 años en la Unidad de Evaluación Psicológica Iztacala, en los últimos cinco, en la evaluación de los aspirantes a ingresar a las Especialidades de Ortodoncia y Endoperiodontología de la FES Iztacala y, durante dos años, a los médicos aspirantes a las diferentes especialidades del Instituto Nacional de Pediatría, reportándose buen poder predictivo.