Table 4.

Principal components analysis loadings of ELS variables by diagnostic group.

ELS variable	Principal components
	Composite 1	Composite 2	Composite 3
Fragile X syndrome
Dysfluency-con	0.885	− 0.125	− 0.022
Syntax-con	0.868	− 0.256	0.151
Lexical diversity-con	0.864	− 0.201	0.164
Talkativeness-con	0.100	0.197	0.846
Unintelligibility-con	− 0.221	0.843	0.163
Dysfluency-nar	0.740	− 0.155	− 0.086
Syntax-nar	0.697	− 0.492	− 0.189
Lexical diversity-nar	0.673	− 0.497	0.267
Talkativeness-nar	− 0.017	− 0.071	0.919
Unintelligibility-nar	− 0.272	0.846	− 0.017
Down syndrome
Dysfluency-con	0.291	0.840	− 0.171
Syntax-con	0.787	0.387	0.129
Lexical diversity-con	0.801	0.392	0.102
Talkativeness-con	0.121	− 0.227	0.842
Unintelligibility-con	− 0.815	− 0.038	0.135
Dysfluency-Nar	0.204	0.833	− 0.042
Syntax-nar	0.843	0.382	0.005
Lexical diversity-nar	0.820	0.273	0.317
Talkativeness-nar	− 0.069	0.041	0.881
Unintelligibility-nar	− 0.782	− 0.039	0.092

n = 80 (FXS), n = 78 (DS). Bolded values were those that loaded most highly on the component and thus, these are taken as the variables defining the component.