Table 1. Demographic composition of the pool of volunteers.

xl2	xl1
	1	2	3	4	5	N/A	Total
2	1	0	2	0	1	0	4
3	2	0	3	4	2	0	11
4	13	2	26	26	6	1	74
N/A	0	0	0	0	0	2	2
Total	16	2	31	30	9	3	91

Note:

N/A corresponds to non-valid answers.