GSE · Schwarzer & Jerusalem (1995) · 10 items · ~3 minutes
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This is a total score from 10–40 — the sum of 10 items each rated 1–4 — so it's compared below against other total scores, not a percentage.
Source: Scholz, U., Gutiérrez-Doña, B., Sud, S., & Schwarzer, R. (2002). Is general self-efficacy a universal construct? Psychometric findings from 25 countries. European Journal of Psychological Assessment, 18(3), 242–251. Note that significant cross-cultural variation exists — scores reflect cultural norms as much as individual trait differences.