TABLE 2

Comparison of Mean IQ and Achievement Scores for Children With and Without SSC

Neurodevelopmental TestControl GroupCase GroupCase Versus Control Group
UnadjustedAdjusteda
NMean (SD)NMean (SD)Difference (95% CI)PDifference (95% CI)P
Full-Scale IQ183110.2 (15.3)182103.2 (16.0)−7.0 (−10.2 to −3.8)<.001−3.9 (−6.7 to −1.2).006
Math computation182104.1 (14.6)18098.7 (13.4)−5.5 (−8.4 to −2.6)<.001−4.2 (−6.8 to, −1.5).002
Reading composite183109.3 (17.2)180105.4 (16.5)−4.0 (−7.4, −0.5).03−2.0 (−5.2 to, 1.2).21
Spelling182107.2 (14.3)180105.2 (16.1)−2.2 (−5.3 to 1.0).18−0.9 (−3.8 to 2.0).54
Total word reading efficiency179106.6 (14.4)180104.0 (16.1)−2.5 (−5.7 to 0.6).12−0.9 (−3.9 to 2.1).57
Phonological awareness179111.1 (14.5)179107.1 (15.5)−4.0 (−7.1 to −0.9).01−2.5 (−5.4 to 0.4).09
Rapid naming172101.0 (10.9)167100.3 (12.2)−0.8 (−3.3 to 1.7).530.3 (−2.1 to 2.7).80
  • a Adjusted for age (continuous), gender, SES (continuous), maternal IQ (continuous).