Table 2.

Main results on general psychopathology

First author Year	Methodology (n)	Main results
Serra L [38] 2014	Personality: MMPI-2	Mild psychiatric problems: 37%
	DM1 (27)	Greater psychiatric problems: 53%
Kalkman JS [36] 2007	Psychopathology: SCL-90	At least one lifetime psychiatric disorder: 33%
	DM1 (70)	Current psychiatric disorder (1-month): 11%
Palmer BW [22] 1994	Psychopathology: MCMI-II	Somatization: 38%
	DM1 (21)	Paranoia signs: 4.76% (n = 1)
Franzese A [37] 1991	Personality: MMPI	In general: normal MMPI profile
	DM1 (24)	1-Hs elevated: 45.80% (n = 8)
		8-SC elevated: 16.60% (n = 5)
		4-Pd elevated: 10.70% (n = 4)
Brumback RA [29] 1987	Personality: MMPI	8-SC, 1-Hs, and 3-Hy elevated
	DM1 (16)
Bird TD [30] 1983	Personality: MMPI	Mild psychiatric problems: 56%
	DM1 (29)
Ambrosini PJ [3] 1979	Literature review	In Maas et al. [4]: schizoid (n = 1), paranoid (n = 1), epileptoid (n = 1), hypomanic (n = 2), hysteroid (n = 1) manifestations

Note: For more clarity, we did not develop all results. 1-HS = Hypochondriasis MMPI scale; 4-Pd = Psychopathic deviation MMPI scale; 8-SC = Schizophrenia MMPI scale; BDI = Beck Depression Inventory; DM1 = Myotonic Dystrophy type 1; MCMI-II = Millon Clinical Multiaxial Inventory; MMPI = Minnesota Multiphasic Personality Inventory; SCID-I = Structured Clinical Interview for DSM-IV (axis I disorders); SCL-90 = Symptom Checklist-90.