Self-Efficacy Scale.The study used an adapted version (Cumsille, Martínez, Rodriguez, & Darling, 2014) of the scale developed by Sherer et al. (1982) and Sherer and Adams (1983)
, which includes 6 items that evaluate SB (e.g., I can focus on a task and persist in doing it). The items are answered in a five-point Likert scale (1= does not describe me at all to 5= completely describes me).
The score was computed by adding the 6 items together. Possible scores range from 6 to 30 points: the higher the score, the stronger the SB (α=.80).