Table 1.

Study variables.

Variable category and variable type		Screening	Baseline	Brain training	Car race	Dance
Characteristics
	Demographics	✓	N/Aa	N/A	N/A	N/A
	UCLAb Loneliness Index	✓	N/A	N/A	N/A	N/A
	Perceived Stress Scale	✓	N/A	N/A	N/A	N/A
	General Self-Efficacy	✓	N/A	N/A	N/A	N/A
	Self-assessment of mental/physical health	✓	N/A	N/A	N/A	N/A
	Prestudy appraisal of game (IFc)	✓	N/A	N/A	N/A	N/A
Cognitive
	Montreal Cognitive Assessment (IF)	N/A	✓	N/A	N/A	N/A
	Picture Encode/recall (DVd)	N/A	N/A	✓	✓	✓
	Stroop (DV)	N/A	N/A	✓	✓	✓
Biometrics
	Heart rate and heart rate variability (DV)	N/A	✓	✓	✓	✓
	Electrodermal activity (DV)	N/A	✓	✓	✓	✓
	Accelerometer (CVe)	N/A	✓	✓	✓	✓
	Saliva cortisol (DV)	N/A	✓	✓	✓	✓
Subjective
	Postgame appraisal survey (DV/IVf)	N/A	N/A	✓	✓	✓
	STAI-6g (DV)	N/A	N/A	✓	✓	✓

^aN/A: not applicable.

^bUCLA: University of California, Los Angeles.

^cIF: independent factor.

^dDV: dependent variable.

^eCV: control variable.

^fIV: independent variable.

^gSTAI: Spielberger State-Trait Anxiety Inventory.