. Author manuscript; available in PMC: 2023 Mar 13.

Published in final edited form as: Infancy. 2022 Jul 1;27(5):916–936. doi: 10.1111/infa.12487

TABLE 7.

Results of generalized linear models predicting 18-month receptive vocabulary from count of adult- and infant-initiated conversations at 6 months

Predictors	Incidence rate ratios	CI	p	Incidence rate ratios	CI	p	Incidence rate ratios	CI	p
(Intercept)	52.07	41.51, 65.14	<0.001	56.10	44.99, 69.70	<0.001	52.81	41.55, 66.91	<0.001
Count of adult-initiated conversations	1.00	1.00, 1.00	0.146				1.00	1.00, 1.00	0.206
Count of infant-initiated conversations				1.00	1.00, 1.00	0.427	1.00	1.00, 1.00	0.712
R²Nagelkerke	0.168			0.054			0.178

Note: N = 89, models are generalized linear models utilizing quasi-Poisson distributions.