VAS: Visual Analogue Scale.
CAS: Coloured Analogue Scale.
STAI: Spielberger short-State Trait Anxiety Inventory.
FAS: Facial Affective Scale.
MD: mean difference.
E1: first entrainment.
E2: second entrainment.
C: Control group.
Negative MD: decreased mean difference.
Positive MD: increased mean difference.
95% CI of the MD: Confidence Interval.
SD: Standard deviation.