Table 2.
Age, MacArthur-Bates Communicative Development Inventory - Words and Gestures Scores, and Mullen Scales of Early Learning: Expressive and Receptive Language Scores
| LL-Neg | HL-Neg | HL-ASD | |
|---|---|---|---|
| Mean (SD) | Mean (SD) | Mean (SD) | |
| Age 12 months | |||
| n | 112 | 199 | 57 |
| Age (months) | 12.60 (0.65) | 12.57 (0.56) | 12.60 (0.63) |
| Mullen Expressive | 12.83 (2.76) | 11.94 (2.94) | 10.34 (2.90) |
| Mullen Receptive | 12.40 (1.93) | 11.14 (2.44) | 9.70 (2.52) |
| Early Raw Scores (SD) | 10.70 (2.63) | 10.09 (2.94) | 8.26 (3.34) |
| Later Raw Scores (SD) | 14.30 (7.46) | 11.23 (6.67) | 8.79 (6.34) |
| Age 18 months | |||
| n | 51 | 80 | 23 |
| Age (months) | 18.45 (0.64) | 18.35 (0.92) | 18.38 (1.00) |
| Early Raw Scores (SD) | 14.88 (2.22) | 14.18 (2.63) | 11.74 (4.03) |
| Later Raw Scores (SD) | 29.46 (7.24) | 26.27 (7.44) | 20.23 (7.83) |
| Age 24 months | |||
| n | 108 | 183 | 60 |
| Age (months) | 24.59 (0.73) | 24.64 (0.69) | 24.53 (0.78) |
| Mullen Expressive | 25.49 (4.99) | 24.24 (5.29) | 18.17 (5.50) |
| Mullen Receptive | 27.49 (3.98) | 26.08 (4.37) | 17.95 (7.77) |
| Early Raw Scores (SD) | 16.44 (1.69) | 16.04 (2.00) | 12.33 (3.17) |
| Later Raw Scores (SD) | 37.86 (5.53) | 34.38 (6.84) | 24.10 (8.22) |
Notes. HL-ASD, high likelihood for autism infants who were diagnosed with ASD at 24 months of age; HL-Neg, high likelihood for autism infants who were not diagnosed with ASD at 24 months of age; LL-Neg, low likelihood for autism infants who were not diagnosed with ASD at 24 months of age; SD indicates standard deviation; Receptive and Expressive Language are collected from Mullen Scales of Early Learning and are scores based on age of equivalence. Mullen measure was only collected at 12 and 24 months of age.