TABLE 1.

Descriptive statistics and correlations of study variables^a

Variable	Scale	M	SD	1	2	3	4	5
Before reading textbook
1. Baseline prosocial Affordance beliefs	1–7	4.23	1.22	—
2. Baseline topic interest	1–7	4.04	1.56	0.62***	—
After reading textbook
3. Prosocial affordance beliefs	1–7	4.41	1.32	0.50***	0.35***	—
4. Topic interest	1–7	4.01	1.31	0.38***	0.51***	0.58***	—
5. Perceived competence	1–5	2.57	0.84	0.28***	0.25**	0.27***	0.37***	—
6. Quiz score	0–9	5.66	1.63	0.08	0.14*	0.07	0.16*	0.24***

^aN = 195. Asterisks indicate significant coefficients: *p < 0.05; **p < 0.01; ***p < 0.001.