. 2023 Aug 7;19(3):e1330. doi: 10.1002/cl2.1330

Table 9.

Cluster robust meta‐regression for follow‐up years for academic effect sizes (between).

Effect	Hedges’ g	95% CI of g	df	p
Intercept^a	0.92	(0.15, 1.68)	1.06	0.041
Follow‐up years	−0.07	(−0.16, 0.01)	1.35	0.062

Note: N of studies = 4, N of effect sizes = 37, assumed ρ = 0.8, I ² = 31.85. Cluster robust estimates with df < 4.00 should be interpreted with caution (Tanner‐Smith, Tipton, & Polanin, 2016). Positive effect sizes favor Montessori over traditional education.

Abbreviation: CI, confidence interval.

^{^a}

Reference category/intercept.