Table 1.

Distribution of age, years of education, membership of research site, gender, and handedness in the entire sample and among subsamples (age, gender, handedness, and research site were accounted as covariates of no interest in the analyses)

Measures	Entire sample (n = 276)			Collaborating research sites									ANOVAa, or Chi‐squareb
				Site 1: Bonn			Site 2: Berlin			Site 3: Mannheim
	n	Mean	S.D.	n	Mean	S.D.	n	Mean	S.D.	n	Mean	S.D.	P
Age (years)	276	33.77	9.96	123	33.07	10.3	77	35.47	9.24	76	33.2	10.12	0.212a
Years of education	276	15.55	2.54	123	15.7	2.73	77	15.31	2.55	76	15.55	2.23	0.573a
Participants (n)	276			123			77			76			<0.001*, b
Gender (n)
Male	133			59			39			35			0.848b
Female	143			64			38			41
Handedness (n)
Right‐handed	242			115			57			70			0.01*, b
Left‐handed	21			8			8			5
Both‐handed	6			0			5			1

^aANOVA: between subjects factor: research site.

^bChi‐squared test with all research sites.

*P < 0.05.