Table 2. Results from the principal component analysis after Oblimin rotation with Kaiser normalisation.

Behavioural Variable	Confidence	Physical Engagement	Social Engagement	Aggression
V. Flight distance	0.80	−0.12	−0.04	0.04
V. Secondary response	0.82	0.00	−0.12	−0.14
V. Lasting effect	0.78	−0.01	−0.18	0.14
G. Fearfulness	0.65	0.07	−0.17	0.64
G. Secondary response	0.57	0.16	−0.19	0.35
G. Lasting effect	0.66	0.26	−0.32	0.23
Metal stair	−0.13	0.50	0.05	0.42
Reaction on table	−0.06	0.75	−0.08	−0.03
Object	0.01	0.80	−0.13	−0.07
Affability	0.11	0.17	−0.86	0.10
Handling	0.05	0.07	−0.86	0.20
Leash	0.19	0.25	−0.83	0.16
Reaction in dark room	0.17	−0.17	−0.66	0.10
V. Aggression	−0.15	0.04	−0.19	0.77
G. Aggression	0.41	−0.11	−0.14	0.70
Tug-of-war	0.15	0.48	−0.14	−0.03
Chasing	−0.02	0.26	−0.17	−0.06
Interest in object	0.09	0.05	−0.20	0.20
A. Flight distance	0.46	−0.02	0.12	0.11
A. Secondary response	0.18	0.06	0.11	0.10
A. Lasting effect	0.29	0.18	−0.13	−0.09
Search Intensity	0.17	0.28	−0.06	0.01
Search Persistence	0.25	0.28	−0.13	−0.07
Gun-shot Fear	0.03	0.32	−0.36	0.30
Gun-shot Curiosity	−0.04	0.25	0.19	0.12
% Variance explained	21.7	13.4	11.1	6.8

The table shows the SAF T-test variable loadings of the first four of the six components with eigenvalues >1. Loadings above 0.5 are shown in bold. A – acoustic startle sub-test; G – gradual visual startle sub-test; V – visual startle sub-test. The total variance explained by these four factors is 53.1%. N = 76.