Table 1.

Demographic Characteristics of Participants and Controls

	Group 1				Group 2
	Patients (n = 48)	Controls (n = 54)	χ2/t	p-value	Patients (n = 531)	Controls (n = 267)	χ2/t	p-value
Sex (male/female)	14/34	21/33	−1.028	0.307	229/302	120/147	−0.488	0.626
Age (years)	40.46 ± 10.47	37.99 ± 10.26	−1.189	0.237	34.26 ± 12.06	32.53 ± 11.26	−1.938	0.053
Education (years)	11.96 ± 3.68	15.19 ± 3.13	4.768	<0.001	11.72 ± 3.42	13.61 ± 3.59	7.522	<0.001