The Prader-Willi syndrome Profile: validation of a new measure of behavioral and emotional problems in Prader-Willi syndrome

Table 2 Profile factor labels, eigenvalues, % variances, Cronbach’s alphas, and mean factor scores

PWS Profile Factor Labels	Rotated Eigenvalue	% Variance	Cumulative % Variance	Alphas	Mean (SD)
(1) Rigidity, Insistence	5.309	12.950	12.950	0.87	2.02 (0.51)
(2) Aggressive Behaviors	4.062	9.907	22.856	0.87	1.72 (0.51)
(3) Repetitive Questioning, Speech	3.371	8.222	31.079	0.82	2.24 (0.56)
(4) Compulsive Behaviors	2.593	6.325	37.403	0.74	2.02 (0.57)
(5) Depressed, Anxious	2.444	5.961	43.364	0.72	1.62 (0.46)
(6) Hoarding	2.430	5.927	49.291	0.80	2.00 (0.72)
(7) Negative Distorted Thinking	2.355	5.745	55.035	0.81	1.70 (0.62)
(8) Magical Distorted Thinking	2.248	5.483	60.518	0.72	1.64 (0.59)
Skin-Picking*				0.54	2.12 (0.68)
Total PWS Profile				NA	14.93 (2.06)

*Note. Not included in final factor analyses as this domain only includes 2 items, with a low alpha. They are, however, retained in the Profile as they frequently occur in PWS

ISSN: 1750-1172