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. Author manuscript; available in PMC: 2018 Jan 1.
Published in final edited form as: Lang Learn Dev. 2016 Jul 13;13(1):54–79. doi: 10.1080/15475441.2016.1193020

Table 3.

Descriptive Statistics for Child Measures by Condition by Measurement Point

Control Treatment
M SD M SD t
C&I Utterances
 21 Months 101.63 73.90 143.26 108.38 −1.38
 24 Month 170.05 86.19 237.63 164.29
 27 Months 225.95 116.24 258.63 139.63
 30 Months 265.32 85.83 254.95 101.99
MLU
 21 Months 1.20 0.22 1.23 0.22 −0.37
 24 Months 1.55 0.46 1.52 0.48
 27 Months 1.93 0.48 1.95 0.47
 30 Months 2.26 0.48 2.34 0.66
CNDW
 21 Months 18.53 12.38 26.11 14.02 −1.77
 24 Months 47.11 25.91 52.26 18.95
 27 Months 75.11 31.64 79.37 25.03
 30 Months 91.79 25.36 102.00 36.35
Verb diversity (in 1st person sentences)
 21 Months 0.84 1.86 1.05 1.68 −0.37
 24 Months 3.89 3.68 3.32 4.10
 27 Months 7.89 5.13 6.37 5.22
 30 Months 9.53 4.23 10.05 4.84
Sentence diversity (in 3rd person sentences)
 21 Months 0.16 0.69 0.37 0.68 −0.95
 24 Months 2.11 3.13 2.68 2.67
 27 Months 6.42 5.22 5.68 4.67
 30 Months 10.47 6.82 13.95 8.70

Note. C&I Utterances = Total number of spontaneous, complete, and intelligible utterances; MLU = mean length of utterances in morphemes; CNDW = child number of different words; Control n =19; Treatment n = 19. No t-test comparisons were significantly different at p < .05.