Table 4.8.

Sensitivity Analysis. One Student Class Size Reduction, Inclusion of Standardised Mean Difference (SMD) with Unclear Sign and Extremes of the Range of STAR SMDs. Separately by Outcome. SMD with 95% Confidence Interval (CI).

				95% CI
Outcome	Change to analysis	Number of studies k	Mean SMD	Lower	Upper
Reading		5	0.11	0.05	0.16
	One student reduction in class size in Bressoux, 2009 and Gerritsen, 2017	5	0.03	‐0.01	0.07
	Include Hudson (2011) with positive SMD	6	0.07	0.01	0.12
	Include Hudson (2011) with negative SMD	6	0.06	‐0.03	0.15
	Include Hanushek (1999) KG	6	0.12	0.07	0.17
	Include Folger (1989) 1G	6	0.14	0.05	0.24
Mathematics		4	‐0.03	‐0.22	0.16
	One student reduction in class size in Bressoux, 2009 and Gerritsen, 2017	4	‐0.00	‐0.07	0.07
	Include Hudson (2011) with positive SMD	5	0.02	‐0.07	0.11
	Include Hudson (2011) with negative SMD	5	‐0.00	‐0.11	0.1
	Include Finn (2001) 3G	5	0.03	‐0.10	0.17
	Include Folger (1989) 1G	5	0.05	‐0.13	0.23