. Author manuscript; available in PMC: 2016 Jul 1.

Published in final edited form as: J Autism Dev Disord. 2015 Jul;45(7):2056–2066. doi: 10.1007/s10803-015-2368-y

Table 4.

Results of Multivariable Logistic Regression Analyses Stratified by “Autistic Disorder” versus “Other ASD”, Showing the Association Between IPI and ASD Among Birth Cohort Members (Second-Born Infants in the Surveillance Area Who Survived Infancy, Birth Years 1994, 1998, 2000), with Adjusted ORs (95% CIs) and p-values.

	Adjusted OR (95% CI)
IPI Category	Autistic Disorder (n=120 cases)	Other ASD (n=34 cases)
<12 months	2.75 (1.56, 4.84)	0.66 (0.18, 2.41)
12-23 months	1.80 (1.07, 3.03)	0.87 (0.34, 2.20)
24-47 months	1.00 (reference)	1.00 (reference)
48-59 months	1.81 (0.84, 3.93)	0.46 (0.06, 3.60)
60-83 months	1.76 (0.83, 3.73)	1.95 (0.66, 5.79)
84+ months	1.92 (0.83, 3.73)	2.72 (0.99, 7.49)

Adjusted for birth year, maternal education, maternal age, sex of baby, and 1^st trimester prenatal care. Sample and co-variates are consistent with Model #2 of Table 3. (N=31,440)