In the first step, the main effect of accumulated musical practice proofed to be a highly significant predictor of interoceptive accuracy, accounting for 44.4% of the variance [ R 2 = 0.490, F (1, 11) = 10.60, p = 0.008, f 2 = 0.96].
The multiple regression model with two psychometric predictors in the first block just failed to reach significance at R 2 = 0.463, F (2, 10) = 3.87, p = 0.057, Cohen's f 2 = 0.77.
In musicians, an independent samples t -test revealed that musical performance anxiety MPA was significantly lower for solo situations in singers ( M = 46.3, SD = 9.89) than in string-players [ M = 59.67, SD = 12.73; t (23) = −2.94, p = 0.007; d = −1.177], whereas ensemble MPA did not achieve significance [ t (23) = −1.99, p = 0.058; d = −0.797].