highly significantp < 0.001
When the three academic motivation subdimensions (IM, EM, amotivation) were added in Model 2, the overall model became highly significant, F (4, 59) = 7.315, p < 0.001, accounting for 33.2% of the variance in learning burnout ( R 2 = 0.332, adjusted R 2 = 0.286), with a significant incremental ΔR 2 = 0.310 ( p < 0.001) compared to Model 1.