highly significantP <0.001
A 3 (difficulty) x 11 (sound level) x 2 (noise sensitivity groups) mixed-factors analysis of variance (ANOVA) in which task difficulty and sound level constituted within-subjects factors revealed a highly significant main effect of sound level on the annoyance ratings, F (10,270)=46.06; P <0.001; η 2 =0.19.