Table 4.

Confusion matrix of the repartition of subjects into clusters.

Cluster	n ${\mathrm{A}}_{\mathrm{Y}}$	n ${\mathrm{A}}_{\mathrm{S}}$	n $\mathrm{P}{\mathrm{D}}_{\mathrm{o}\mathrm{f}\mathrm{f}}$	n $\mathrm{P}{\mathrm{D}}_{\mathrm{o}\mathrm{n}}$
upper	17	5	2	4
intermediate	16	10	4	6
lower	0	2	4	7
n total	33	17	10	17