Table 2.

Variable Calculation

Instrument	Score	Variable	Stage
Knowledge and Attitude Assessment	Sum of scores on knowledge questions	Knowledge*	2 and 3
	Sum of questions involving participant's appraisal of personal risk of Chlamydia	Appraisal of personal risk*	2 and 3
	Single question involving participant's problem hierarchy for Chlamydia	Problem hierarchy*	2 and 3
	Sum of scores on questions involving intent to get tested for Chlamydia	Testing intent*	2 and 3
	Sum of scores on condom use questions	Condom attitude*	2 and 3
	Sum of scores on familiarity of environment facilitator questions	Environmental facilitator*	2 and 3
PANAS	Sum of scores on 10 positive affects	Positive affect*	2 and 3
	Sum of score on 10 negative affects	Negative affect*	2 and 3
Self-reported Learning	Sum of score on participant's subjective opinion on game's educational function	Self-reported learning	3
Game Score	Rank the participants based on their game score	Game rank	2 and 3
Player Experience Questionnaire	Sum of scores on game enjoyment questions	Game enjoyment	2 and 3
	Sum of scores on 2 good mood subscale questions minus sum of scores on 3 bad mood subscale questions.	Game mood	2 and 3
	Sum of scores on game engagement questions	Game engagement	2 and 3
	Sum of scores on social engagement questions	Social engagement	2 and 3
	Sum of scores on Game Participation questions	Participation	2 and 3

Variables marked with ^* have both a pre- and postintervention component (e.g., preknowledge and postknowledge).

PANAS, Positive Affect, Negative Affect Scale.