Table 4. Physiological profiles of the 5 behaviourally-discriminated clusters.

Variables (mean ± SEM)	group A; n = 14	group B; n = 14	group C; n = 5	group D; n = 4	group E; n = 3
Plasmatic concentrations
[ACTH] (pg/mL)	23.6±3.3	24.1±3.1	20.3±6.3	14.2±1.6	20.1±6.4
[cortisol] (ng/mL)	114.6±19.2	108.2±16.0	86.1±21.5	127.5±7.2	83±15.2
CSF concentrations (ng/mL)		n = 12
[5-HT]	4.5±2.1	3.5±2.4	0.7±0.2	1±0.5	0.6±0.3
[HIAA]	53.6±4.7	51±4.3	55.7±7.7	46.8±4.5	53.6±6.0
[DA]	2.2±0.3	1.5±0.2	1.4±0.4	2.8±0.5	1.8±0.2
[DOPAC]	2.6±0.2	2.2±0.2	2.4±0.2	2.3±0.3	1.9±0.3
[HVA]	54.6±6.4	59.3±7.0	73.5±5.9	41.5±5.9	48.6±10.2
[NE]	2.7±0.7	2±0.3	1.7±0.6	4.5±2.7	1.9±0.2

The mean plasmatic or spinal concentrations (± standard error means) per cluster are reported below for the following measured variables: adrenocorticotropic hormone (ACTH); cortisol; serotonin (5-HT); 5-hydroxyindoleacetic acid (5-HIAA); dopamine (DA); homovanillic acid (HVA); 3,4-Dihydroxyphenylacetic acid (DOPAC); and norepinephrine (NE). No statistical difference was found (see Table S1 for full Kruskal-Wallis statistics).