TABLE 6.

Assessment of mental health and well-being.

concept	type of questionnaire	total no. of items	subscales used in current study (no. of items)	reliability (Cronbach’s alpha) of the questionnaires and subscales used in the online study and the laboratory study
depression	Beck Depression Inventory (BDI-II), German version (Hautzinger et al., 2010)	21	total score (21)	0.84 (n = 36 patients with major depression) 0.90 (n = 52 patients with major depression leaving hospital) 0.89 (n = 315 non-clinical control group) (see Kühner et al., 2007)
anxiety	State-Trait Anxiety Inventory (STAI), German version (Laux et al., 1981)	40	state anxiety (20) trait anxiety (20)	state anxiety 0.91 (n = 244 male control group, age range 15–29 years) 0.91 (n = 342 female control group, age range 15–29 years) 0.90 (n = 171 male students) 0.92 (n = 222 female students) trait anxiety 0.89 (n = 244 male control group, age range 15–29 years) 0.92 (n = 342 female control group, age range 15–29 years) 0.90 (n = 171 male students) 0.90 (n = 222 female students)
stress	Stress Coping Inventory (SCI) (Satow, 2012)	54	stress overall stress (21) uncertainty (7) excessive demands (7) loss experience (7) psychosomatic symptoms (13) coping positive thinking (4) active stress reduction (4) social support (4) belief/religion (4) alcohol/cigarette consumption (4)	(n = 5220 control subjects) 0.82 0.72 0.69 0.69 0.86 0.74 0.74 0.88 0.78 0.75
mood/affect	Positive and Negative Affect Schedule (PANAS) (Watson et al., 1988), German version (Krohne et al., 1996)	20	state positive affect (10)	0.85 (n = 349 control subjects)
			state negative affect (10)	0.86 (n = 349 control subjects)
			trait positive affect (10)	0.84 (n = 480 control subjects)
			trait negative affect (10)	0.86 (n = 480 control subjects)
physical activity	Global Physical Activity Questionnaire (GPAQ) (Armstrong and Bull, 2006)	16	physical activity - when working (6) - when traveling (3) - during leisure time (6) sedentary time (1)	retest-reliability (total score) across studies: r = 0.58–0.89 (Keating et al., 2019)
quality of life	WHOQOL-BREF (Whoqol Group, 1998)	26	total score (26)	subscales: (n = 2073 subjects)
			physical health	0.77
			well-being	0.78
			social relationship	0.82
			environment	0.87
body dissatisfaction	Eating Disorder Inventory (EDI-2), German short version (Thiel and Paul, 1988)	64	body dissatisfaction (9)	0.88 (n = 246 patients with anorexia nervosa, n = 217 patients with bulimia nervosa)
				0.89 (n = 186 female control group)
				0.84 (n = 102 male control group)

Overview of the self-report questionnaires used in the two pilot studies. Reliability indices are reported where available.