Parameter | Volume of vocalization | Kind of vocalization | Kind of movement |
---|---|---|---|
Score | |||
1 | No vocalization | No vocalization | No movement |
2 | Silent grunting | Short, rare vocalization | Minor movement |
3 | Low squealing or whimpering | Discontinuous vocalization with longer breaks (>  3 s) | Stretching of legs and head shaking |
4 | Moderately loud screaming | Discontinuous vocalization with shorter breaks (<  3 s) | Struggling and occasional escape attempts |
5 | Deafening screaming | Continuous vocalization | Defense movements and continuous escape attempts |