Table 2.

Results of Meta-regression Analyses

Predictor	Studies	Outcomes		SE	t	df	p
Model 1: Intervention Intensity	12	265
Intercept			0.28	0.11	2.54	7.07	0.038**
Cumulative intensity in hours			0.09	0.12	0.75	1.33	0.563
Model 2: Interventionist	27	453
Intercept (Reference: Caregiver)			0.34	0.09	3.98	12.57	0.002***
Clinician			0.12	0.19	0.67	4.42	0.539
Combination			−0.26	0.19	−1.37	6.71	0.215
Educator			0.01	0.16	0.09	7.30	0.931
Model 3: Chronological Age	27	453
Intercept			0.31	0.06	4.93	24.04	< 0.001***
Age in Months			−0.06	0.05	−1.22	8.08	0.256
Model 4: Biological Sex	25	417
Intercept			0.33	0.06	5.19	18.50	< 0.001***
Percent Male			−0.06	0.05	−1.36	9.30	0.204
Model 5: Language Age	10	228
Intercept			0.34	0.09	3.84	7.44	0.006***
Language Age Equivalency			−0.02	0.05	−0.34	2.77	0.758
Model 6: Outcome Boundedness	27	453
Intercept (Reference: Context-bound)			0.55	0.09	6.10	11.30	< 0.001***
Generalized			−0.40	0.11	−3.53	15.00	0.003***
Potentially Context-bound			−0.31	0.13	−2.49	19.30	0.022**
Model 7: CME	27	453
Intercept (Reference: High Risk)			0.37	0.72	5.21	20.80	< 0.001***
Low Risk			−0.17	0.10	−1.66	22.50	0.112
Model 8: Outcome Proximity	27	453
Intercept (Reference: Distal)			0.20	0.08	2.40	17.20	0.028**
Proximal			0.25	0.11	2.17	23.80	0.041**

Note. CME = Correlated measurement error.

^***p < .01

^**p < .05

^*p < .10