Table 1.

Descriptive Information for Mothers, Children with FXS, and Siblings

	Maternal IQ	Maternal Education Level		Chronological Age in months	Developmental Level Test Scoresa	Gender
Family 1	128	19	Child with FXS	62	53	M
			Sibling	61	94	M
Family 2	108	17	Child with FXS	35	49	M
			Sibling	35	121	F
Family 3	110	18	Child with FXS	70	55	M
			Sibling	70	117	F
Family 4	111	13	Child with FXS	40	49	M
			Sibling	41	*	M
Family 5	125	18	Child with FXS	55	49	M
			Sibling	55	117	M
Family 6	123	15	Child with FXS	67	49	M
			Sibling	68	118	M
Family 7	122	17	Child with FXS	66	52	M
			Sibling	66	101	F
Family 8	119	16	Child with FXS	36	50	M
			Sibling	36	95	F
Family 9	111	15	Child with FXS	22	54	M
			Sibling	22	111	M
Family 10	86	14	Child with FXS	16	50	M
			Sibling	16	91	F
Family 11	121	14	Child with FXS	36	49	M
			Sibling	37	123	F
Family 12	99	16	Child with FXS	71	49	M
			Sibling	69	104	M
Family 13	101	16	Child with FXS	19	58	M
			Sibling	19	*	M

Note. Rows represent individual family units: mother, child with FXS, and typically developing sibling.

^aDevelopmental level: The Mullen Scales of Early Learning composite score was used for the children with FXS; the siblings were given the Peabody Picture Vocabulary Test (PPVT-III; citation). Standardized scores are presented for the participants.

^*Missing data