TABLE 5.

Numerical comparison of birthweight percentile and gestational age groups

Gestational age groups	23–31 wks				32–33 wks				34–36 wks				37–38 wks				39–41 wks				≥42 wks
	No autism		Autism		No autism		Autism		No autism		Autism		No autism		Autism		No autism		Autism		No autism		Autism
	n	%	n	%	n	%	n	%	n	%	n	%	n	%	n	%	n	%	n	%	n	%	n	%
Birthweight percentile
SGA <5%	2423	5	30	8	2971	5	23	10	17,513	4	87	5	58,053	5	256	5	160,921	5	620	5	18,706	5	74	6
SGA 5–10%	2722	5	28	8	3079	5	13	5	18,533	5	95	6	63,558	5	252	5	172,256	5	609	5	20,168	5	73	6
AGA >10 to <90%	40,470	79	293	80	51,279	80	185	78	319,225	80	1325	79	1,018,370	80	3855	79	2,673,571	80	9184	78	311,709	80	986	77
LGA 90–95%	3028	6	9	2	3730	6	6	3	21,771	5	85	5	66,445	5	246	5	174,857	5	658	6	20,411	5	79	6
LGA >95%	2641	5	7	2	3427	5	10	4	20,704	5	77	5	63,750	5	273	6	165,432	5	689	6	19,365	5	74	6

AGA, appropriate-for-gestational age; LGA, large-for-gestational age; SGA, small-for-gestational age.

Moore. Autism risk by birthweight percentile. Am J Obstet Gynecol 2012.