Table 2. Estimates for ventilation rate and indoor T based on two alternative models ^a .

Description of the model		Estimates for each predictor b individually			Final model
Alternative models	Mean	Estimate	95% CI	Sig	Estimate	95% CI	Sig
Mathematics score 2007–2008 included c
Mathematics score 2007–2008, N = 2675 d	2263.5	.9	.8-.0	.000
Ventilation rate [l/s per person], N = 2661	3.7	19.5	11.0–28.1	.000	6.7	2.0–11.3	.006
Indoor T [°C], N = 2611	22.7	-33.2	-(52.5–13.9)		-4.2	-14.5–6.1	.420
Ventilation rates > 7.1 l/s per person filtered e
Ventilation rate [l/s per person], N = 2951	3.3	36.3	23.7–48.8	.000	11.2	2.0–20.4	.017
Indoor T [°C], N = 2899	22.8	-33.6	-(52.6–14.7)	.001	-12.0	-24.7–0.6	.062

^a Dependent Variable: Mathematics score

^b added to the zero-model

^c Includes previous year’s mathematics score added to the models shown in Table 1.

^d Note: previous year’s mathematics score is not available for all students, which could be related to mobility

^e Final model as in Table 1 (data related to classrooms with ventilation rates > 7.1 l/s per person filtered)