Table 4.

Analysis of the Pervasive Developmental Disorders Behavior Inventory test in the ASD subgroups with and without neurodevelopmental regression at baseline and at a follow-up at 24 months.

PDDBI	Group	N	Basal time	pa	24 months	pb
Sensory	AMR	16	52.63 ± 12.69	0.182	52.31 ± 10.49	0.05
	ANMR	27	49.22 ± 9.38		46.37 ± 9.36*
Ritual score	AMR	16	52.88 ± 11.74	0.711	54.69 ± 9.66	0.038
	ANMR	27	52.56 ± 9.46		48.63 ± 8.52*
Social pragmatic problems	AMR	16	49.13 ± 9.81	0.499	47.31 ± 7.19	0.257
	ANMR	26	46.73 ± 8.51		48.27 ± 6.75
Semantic pragmatic problems	AMR	17	47.65 ± 9.95	0.315	48.94 ± 11.47	0.152
	ANMR	27	49.44 ± 9.32		49.33 ± 8.56
Social approach behaviors	AMR	17	46.18 ± 9.47	0.016	50.12 ± 8.88*	0.048
	ANMR	27	54.04 ± 10.47		56.37 ± 10.48*
Expressive language	AMR	17	46 ± 9.17	0.006	46.06 ± 11.14	0.002
	ANMR	27	55.3 ± 10.98		57.7 ± 11.23
Score autism	AMR	17	53.53 ± 10.69	0.022	52.47 ± 9.73	0.003
	ANMR	27	46.22 ± 9.45		43.59 ± 8.67*

Analysis of the Pervasive Developmental Disorders Behavior Inventory test regarding the neurodevelopmental regression and non-neurodevelopmental regression groups at baseline and after follow-up at 24 months.

Mental Regression (AMR). Without Mental Regression (ANMR). The data are expressed as means ± DS. Mixed-Designs ANOVA with Sidak correction used to compare differences among groups. P < 0.05 value in bold, was considered for significant results. p^a. p between AMR and ANMR at baseline; p^b: p between AMR and ANMR at 24 months follow-up;

^*p < 0.05 between baseline and 24 months follow-up (intragroup).