Factorial structure of short scales measuring manic-depression in Kuwaiti undergraduates.

A sample of 202 Kuwaiti college students (63 men and 139 women; Mage=21.6 yr., SD=2.4) responded to the Thalbourne, et al.'s Manic-Depressiveness Scale. In a factor analysis with a varimax rotation, 14 of 18 items had significant loadings (>.3) on the first factor, including 8 items of the original depression scale. 6 items significantly loaded on the second factor, including 3 items of the original mania scale. This did not match the hypothetical structure of the scale.