Table 1.

Component matrix of the principal component analysis for the agitation component using the raw data and the difference scores

	PC1 raw data	PC1 difference scores
Perch changes	0.87	0.8
Flying	0.38	0.33
Walking	0.86	0.76
Head turns	0.19	0.4
Eigenvalue	1.67	1.49
% of variance explained	42	37

Standardized loadings (pattern matrix) based upon correlation matrix.