Table 2.

Results of the Mann–Whitney U test. $P$ values in bold indicate statistical significance.

Test	$n1$	$n2$	$U$	$P$
A versus N	15	18	158	0.13822
A versus A + N	15	15	74	0.11483
A versus A + V	15	20	64.5	0.00458
N versus A + N	18	15	34	$\mathbf{7.26}\times {\mathbf{10}}^{-\mathbf{4}}$
N versus A + V	18	20	20	$\mathbf{8.93}\times {\mathbf{10}}^{-\mathbf{6}}$
A + N versus A + V	15	20	127	0.45313