Table 5.

Principal component analyses

Component	Eigenvalue	Contribution ratio	Cumulative contribution ratio
1	3.029	33.653	33.653
2	1.551	17.230	50.883
3	1.149	12.770	63.653
4	0.940	10.440	74.093
5	0.781	8.681	82.774
6	0.598	6.643	89.416
7	0.446	4.951	94.367
8	0.290	3.218	97.586
9	0.217	2.414	100.000

Note: Three factors had eigenvalues >1 and explained 63.7% of the variance.