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. Author manuscript; available in PMC: 2019 Sep 1.
Published in final edited form as: Int J Lang Commun Disord. 2018 Aug 5;53(5):1007–1020. doi: 10.1111/1460-6984.12418

Table 4.

Rates per 10 minutes of vocalisation production by outcome group at 14, 18, and 24 months.

HR-ND (n=26) HR-LD (n=15) HR-ASD (n=9)
Vocalisation
Type		 Age Mean (SD) Mean (SD) Mean (SD)
Vowel Only 14 19.08 (13.98) 14.45 (12.00) 4.47 (2.23)
18 16.13 (11.71) 11.09 (12.32) 7.83 (7.28)
24 5.34 (6.98) 8.56 (9.12) 9.27 (8.75)
Syllabic 14 17.18 (14.31) 16.19 (14.54) 6.34 (6.19)
18 21.67 (26.54) 14.25 (14.88) 5.77 (7.50)
24 15.62 (10.77) 25.62 (19.57) 11.62 (10.40)
Word 14 0.07 (0.25) 0.00 (0.00) 0.00 (0.00)
18 4.13 (10.45) 0.21 (0.38) 0.71 (1.91)
24 23.44 (20.17) 2.21 (9.09) 2.12 (4.94)

Note. ND = No Diagnosis; LD = Language Delay; ASD = Autism Spectrum Disorder; SD = Standard Deviation