Table 2.

Pattern matrix showing the loading of each variable onto each component after rotation

Variable	Component 1	Component 2
Eigenvalue (after rotation)	3.61	2.13
Percentage of variance explained	41.83	17.8
Average pain	0.885	0.085
Pain now	0.882	−0.061
Least pain	0.831	−0.087
Percentage pain relief	0.781	−0.027
Worst pain	0.744	0.173
Confusion*	0.083	0.774
Drowsiness	0.024	0.678
Bad dreams	0.070	0.671
Nausea	−0.099	0.554

^*Confusion includes hallucinations. Only factor loadings with an absolute value of >0.4 were interpreted [36](p. 638).