Table 2: Mean and standard deviation of self-reported measures of stress.

Psychological instruments	Mean ± SD
STAI 6-item beginning of the protocol	2.02 ± 0.47
STAI 6-item end of the protocol VAS baseline VAS CRTT1 VAS TSST VAS CRTT2	1.76 ± 0.39 3.39 ± 1.16 3.29 ± 1.36 5.41 ± 1.87 3.24 ± 1.25