Table I.

Psychometric tools used to assess participants in the Mexican gestational surrogacy program.

Test	Objectives	Bernbach alpha	Reference
Beck’s hopelessness scale	Measures feelings about the future, loss of motivation and expectations	0.83	González (2009)
Violence scale	Measures the level of domestic violence	0.99	Valdez et al. (2006)
MINI International Psychiatric	Detects psychiatric disorders	0.76–0.93	Sheehan et al. (1998)
Alcohol, Smoking and Substance Involuntary Screening Test (ASSIST)	Identifies consumption of toxic substances	0.78	Pérez et al. (2012)
Minnesota Multiphasic Personality Inventory 2 Restructured Form (MMPI-2-RF®)	Detects exaggeration or minimization of symptoms, allows a more efficient evaluation	0.81	Ayearst (2011)
Autobiography	To know aspects of their family, personal, sexual and work history	Not measurable by Bernbach alpha	Sabogal (2004)
Machover´s human figure test	Yields data of the emotional experience and emotional maturity, as well as the environment that surrounds the patient	Not measurable by Bernbach alpha	Sabogal (2004)