Figure 6.

Auditory-perceptual and acoustic analyses of patient subgroups: Sulcus vocalis only (n = 6), vocal fold scar only (n = 7) and sulcus vocalis with concomitant scar. (n = 10). A: Mean perceptual rating of voice quality (1: normal; 7: largest deviation from normal). B: Jitter. C: Shimmer. D: Signal-to-noise ratio (SNR). E: Correlation dimension (D₂). For acoustic data (panels B–E), type 1 signals are represented by purple open circles; type 2 signals are represented by green closed circles; type 3 signals are represented by red closed circles. Statistical p-values represent all data (statistical analysis of perturbation data using type 1 signals only was not possible as only one type 1 signal was identified in each patient subgroup).