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. Author manuscript; available in PMC: 2014 Feb 1.
Published in final edited form as: Am J Speech Lang Pathol. 2012 Jul 30;22(1):25–39. doi: 10.1044/1058-0360(2012/11-0145)

Table 7. Wald's chi-square results using ZIP model adjusted for repeated measures.

9-12 months Contrasts (F(1, 108), p) 15-18 months Contrasts (F(1, 108), p)
SI F(2,107) = .79
(p = .4555)		 No contrasts run due to
non-significance		 F(2,107) = 2.46
(p = .0903)		 No contrasts run due to
non-significance
BR F(2,107) = 10.69
(p = .0001)		 AU vs DD (2.15, .1451)
AU vs TD (19.49, <.0001) 		F(2,107)= 2.24
(p =. 1115)		 No contrasts run due to
non-significance
JA F(2,107) = .28
(p = .7565)		 No contrasts run due to
non-significance		 F(2,107) = 5.54
(p = .0051)		 AU vs DD (5.13, .0256)
AU vs TD (11.02, .0012)

Note: The significance threshold was set at p < .05 with Bonferroni-Holm correction employed for multiple comparisons per time point