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Table 2 Descriptive statistics from the 7-year visit RB

From: Neurocognitive and observational markers: prediction of autism spectrum disorder from infancy to mid-childhood

  Low risk High-risk No ASD High-risk ASD Group differences
Age (months)
 Mean (SD) 89.34 (4.81) 91.42 (6.28) 89.13 (6.53) n/s
N (girls) 35* (21) 24 (19) 15 (8)
ADI-social
 Mean (SD) Not completed 4.04 (5.48) 13.14 (4.69) t(36) = − 5.20, p < 0.001
N (girls) 24 (19) 14 (8)
ADI communication
 Mean (SD) Not completed 4.25 (4.67) 10.43 (4.59) t(36) = − 3.96, p < 0.001
N (girls) 24 (19) 14 (8)
ADI RRB
 Mean (SD) Not completed 0.58 (1.41) 3.57 (1.74) t(36) = − 5.77, p < 0.001
N (girls) 24 (19) 14 (8)
ADOS CSS total
 Mean (SD) 1.70 (1.19) 2.46 (1.41) 6.20 (2.78) F(2, 69) = 37.35, p < 0.001, η 2 = 0.520
N (girls) 33 (19) 24 (19) 15 (8)
ADOS CSS SA
 Mean (SD) 2.18 (1.70) 2.96 (1.60) 6.60 (2.59) F(2, 69) = 29.11, p < 0.001, η 2 = 0.458
N (girls) 33 (19) 24 (19) 15 (8)
ADOS CSS RRB
 Mean (SD) 1.12 (0.70) 3.04 (2.84) 6.13 (2.70) F(2, 69) = 29.80, p < 0.001, η 2 = 0.463
N (girls) 33 (19) 24 (19) 15 (8)
WASI FSIQ
 Mean (SD) 117.06 (11.61) 107.96 (12.76) 109.79 (21.36) F(2, 70) = 3.25, p = 0.05, η 2 = 0.085
N (girls) 35 (21) 24 (19) 14 (8)
  1. *Two LR children completed questionnaires only; an exact age at visit was not available for these children
  2. ADI Autism Diagnostic Interview—Revised, RRB Repetitive and restrictive behaviour, ADOS Autism Diagnostic Observation Schedule, CSS Calibrated severity score, SA Social affect, WASI-II Wechsler Abbreviated Scale of Intelligence—II Full-Scale IQ, n/s non-significant