Table 5.

Average score followed by standard deviation of each group according to each principal component of 762 dogs presenting with separation related problems after hierarchical agglomerative analysis.

Principal components	N	A (Nt = 133)	B (Nt = 221)	C (Nt = 271)	D (Nt = 137)
Exit frustration	Nt	0.712 ± 0.183***a	0.096 ± 0.119***b	0.006 ± 0.033***c	0.037 ± 0.078**d
	Ns	0.712 ± 0.183 (Ns = 133)	0.132 ± 0.121 (Ns = 160)	0.155 ± 0.069 (Ns = 11)	0.152 ± 0.087 (Ns = 33)
Social panic	Nt	0.582 ± 0.256***a	0.408 ± 0.269***b	0.414 ± 0.270***b	0.295 ± 0.234***c
	Ns	0.582 ± 0.256 (Ns = 133)	0.432 ± 0.258 (Ns = 209)	0.454 ± 0.249 (Ns = 247)	0.375 ± 0.199 (Ns = 108)
Elimination	Nt	0.197 ± 0.271	0.174 ± 0.263	0.172 ± 0.243	0.142 ± 0.239
	Ns	0.423 ± 0.249 (Ns = 62)	0.428 ± 0.246 (Ns = 90)	0.392 ± 0.22 (Ns = 119)	0.454 ± 0.199 (Ns = 43)
Redirected frustration	Nt	0.698 ± 0.258***a	0.701 ± 0.215***a	0.043 ± 0.87***b	0.294 ± 0.33***c
	Ns	0.698 ± 0.258 (Ns = 133)	0.701 ± 0.215 (Ns = 221)	0.198 ± 0.066 (Ns = 59)	0.511 ± 0.279 (Ns = 79)
Reactive communication	Nt	0.723 ± 0.294**a	0.827 ± 0.197***b	0.854 ± 0.167***b	0.202 ± 0.181***c
	Ns	0.751 ± 0.262 (Ns = 128)	0.827 ± 0.197 (Ns = 221)	0.854 ± 0.167 (Ns = 271)	0.301 ± 0.136 (Ns = 92)
Immediate frustration	Nt	0 ± 0	0.005 ± 0.067	0.003 ± 0.041	0 ± 0
	Ns	0 ± 0 (Ns = 0)	1 ± 0.0 (Ns = 1)	0.667 ± 0.0 (Ns = 1)	0 ± 0 (Ns = 0)
Noise sensitivity	Nt	0.004 ± 0.031	0.020 ± 0.117	0.002 ± 0.021	0.004 ± 0.030
	Ns	0.25 ± 0.0 (Ns = 2)	0.563 ± 0.291 (Ns = 8)	0.25 ± 0.0 (Ns = 2)	0.25 ± 0.0 (Ns = 2)

N_t, all subjects in that cluster; N_s, subjects showing at least one of the signs in that cluster for a given principal component. Bold PCs are significantly different between clusters, with different superscript letters identifying the source of difference,

^**p <0.01;

^***p <0.001.