Table 4.

Predictive criterion validity: linear regression models to examine variance in mathematics accounted for by accuracy and timed tasks in Malawi and UK samples.

Model	Variable(s)	Model		Significance	Change		Unstandardized coefficients	Standardized coefficients	Significance
		R	R2	F (df), p	ΔR2	Sig. ΔF	B, Std. Error	Beta	t, p
MALAWI
1	Accuracy tasks	0.28	0.08	3.37 (3, 123),	0.08	p = 0.021
	Short-term memory			p = 0.021			1.13, 2.78	0.16	1.82, p = 0.071
	Working memory						−1.49, 1.34	−0.10	−1.11, p = 0.269
	Spatial intelligence						2.03, 0.90	0.20	2.25, p = 0.027
2	Accuracy tasks	0.39	0.15	3.51 (6, 120),	0.07	p = 0.019
	Short-term memory			p = 0.003			0.95, 0.61	0.13	1.55, p = 0.123
	Working memory						−1.54, 1.31	−0.10	−1.18, p = 0.241
	Spatial intelligence						1.74, 0.89	0.17	1.95, p = 0.053
	Timed tasks
	Manual processing speed						−0.001, < 0.0001	−0.20	−2.29, p = 0.024
	Manual coordination						0.00002, < 0.0001	0.02	−0.24, p = 0.813
	Visual attention						−0.007, 0.005	−0.14	−1.55, 0.123
UK
1	Accuracy tasks	0.23	0.05	0.74 (3, 40),	0.05	p = 0.534
	Short-term memory			p = 0.534			−0.37, 1.12	−0.06	−0.33, p = 0.743
	Working memory						0.66, 2.41	0.05	0.28, p = 0.785
	Spatial intelligence						1.29, 0.98	0.23	1.32, p = 0.194
2	Accuracy tasks	0.39	0.15	1.13 (6, 37),	0.10	p = 0.232
	Short-term memory			p = 0.363			−0.74, 1.12	−0.11	−0.66, p = 0.514
	Working memory						−0.14, 2.45	−0.01	−0.06, p = 0.956
	Spatial intelligence						1.85, 1.00	0.33	1.84, p = 0.073
	Timed task
	Manual processing speed						−0.003, 0.001	−0.33	−2.06, p = 0.047
	Manual coordination						0.00007, < 0.0001	−0.05	−0.29, p = 0.774
	Visual attention						0.01, 0.01	0.11	0.64, p = 0.524

Significant results highlighted in bold.