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Table 1 Detailed characterisation of HR subgroups and LR controls

From: Developmental change in look durations predicts later effortful control in toddlers at familial risk for ASD

  Low risk High risk
   Combined HR-no ASD HR-ASD
9 months
Nb (% boys) 23 (56.52%) 94c (57.45%) 75 (50.00%) 16 (88.50%)
 Age in months 9.15 (0.74) 9.01 (0.81) 9.05 (0.81) 8.80 (0.83)
8.15–11.05 7.96–11.54 7.96–11.54 8.02–10.39
 MSEL ELC 112.26 (13.79) 105.93 (15.68) 107.33 (15.14) 101.81 (17.25)
81–133 65–123 67–123 65–113
15 months
Nb (% boys) 19 (52.63%) 97c (53.61%) 80 (50.00%) 14 (85.71%)
 Age in months 15.69 (.90) 15.41 (0.99) 15.46 (0.99) 15.09 (1.00)
14.10–17.88 13.87–18.94 13.87–18.94 13.97–17.36
 MSEL ELC 103.84 (16.04)a 93.95 (14.80) 95.96 (14.66)a 84.00 (12.84)
92–144 49–142 49–142 49–119
3 years
Nd (% boys) 24 (58%) 108 (57%) 92 (51%) 16 (88%)
 Age in months 38.58 (1.38) 38.86 (2.25) 39.03 (2.16) 37.87 (2.56)
36–41 30–50 35–50 30–42
 MSEL ELC 120.21 (15.14)a 102.27 (24.97) 105.30 (23.22)a 84.81 (28.21)
69–141 49–145 49–145 49–142
 ADI-social 1.00 (1.50)a 3.52 (4.83) 2.02 (2.58)a 12.13 (5.76)
0–6 0–25 0–12 2–25
 ADI-communication 0.50 (1.06)a 3.96 (4.73) 2.65 (3.31)a 11.50 (4.69)
0–4 0–19 0–14 3–19
 ADI-RRB 0.08 (0.28)a 1.47 (2.42) 0.75 (1.51)a 5.63 (2.55)
0–1 0–10 0–9 0–10
 ADOS-Social CSS 2.58 (2.00) 2.75 (2.22) 2.51 (1.95)a 4.12 (3.12)
1–7 1–10 1–9 1–10
 ADOS-RRB CSS 3.58 (2.30)a 4.29 (2.60) 3.95 (2.59)a 6.25 (1.61)
1–7 1–9 1–9 5–9
SCQ 2.71 (2.31)a 6.36 (6.94) 4.71 (5.35)a 17.93 (6.82)
0–9 0–29 0–27 0–29
  1. MSEL ELC Mullen Scales for Early Learning Early Learning Composite, ADI Autism Diagnostic Interview, ADOS Autism Diagnostic Observation Schedule, CSS Calibrated Severity Score, SCQ Social Communication Questionnaire
  2. Standard deviations are given in parenthesis and minimum and maximum values in italics.
  3. aSignificant differences with the HR-ASD group at p < .05
  4. bSample size based on all participants that contributed look duration data at that visit, with complete measure data
  5. cIncludes three HR infants for whom infant data was collected but were not allocated outcome group status.
  6. dSample size based on all participants that contributed look duration data for at least one infant visit and clinical information at age 3