Prospective study of autism phenomenology and the behavioural phenotype of Phelan–McDermid syndrome: comparison to fragile X syndrome, Down syndrome and idiopathic autism spectrum disorder

Table 6 Correlation coefficients for Spearman’s rank correlations between total SCQ score and demographic/behavioural characteristics

Demographic/behavioural characteristic	PMS	FraX	DS	Idiopathic ASD
Self-help	− 0.20	− 0.07	− 0.21	− 0.02
Age	0.35	0.28	0.24	− 0.11
Mood	− 0.28	− 0.06	0.07	− 0.40
Interest and pleasure	− 0.50 ^a	− 0.20	− 0.38	− 0.14
Stereotyped behaviour	0.36	0.34	0.63	0.12
Compulsive behaviour	− 0.08	− 0.21	0.22	0.39
Insistence on sameness	− 0.04	− 0.32	0.13	0.04
Impulsivity	0.21	0.22	0.32	0.25
Overactivity	0.32	0.25	0.19	0.23

ISSN: 1866-1955