Table A1.

Measurement models and model fits of mental speed general-factor models.

Model	Measurement Model		Model Fit
	ω	Mean Loadings (Range)	χ2 (df)	p	RMSEA [CI]	SRMR	CFI
Only Correlates
WMC	0.43	0.61 (0.44;0.75)	8.07 (5)	0.15	0.07 [0.00;0.15]	0.03	0.97
AB	0.39	0.61 (0.44;0.75)	-	-	-	-	-
+Speed
1/RT	0.69	0.63 (0.47;0.92)	117.41 (69)	0.00	0.07 [0.05;0.10]	0.08	0.95
+Response Time
M RT	0.73	0.65 (0.49;0.92)	103.86 (69)	0.00	0.06 [0.04;0.09]	0.07	0.97
M log(RT)	0.71	0.64 (0.48;0.92)	110.91 (69)	0.00	0.07 [0.04;0.09]	0.07	0.96
Mdn RT	0.72	0.64 (0.49;0.90)	103.22 (69)	0.00	0.06 [0.04;0.09]	0.07	0.96
+RT Quantiles
Q0.20	0.70	0.63 (0.39;0.90)	124.12 (69)	0.00	0.08 [0.06;0.10]	0.08	0.94
Q0.40	0.72	0.64 (0.48;0.90)	115.20 (69)	0.00	0.07 [0.05;0.10]	0.07	0.95
Q0.60	0.72	0.64 (0.49;0.91)	109.82 (69)	0.00	0.07 [0.04;0.09]	0.07	0.96
Q0.80	0.72	0.63 (0.48;0.90)	99.92 (69)	0.01	0.06 [0.03;0.08]	0.06	0.97
Q1.00	0.62	0.54 (0.27;0.91)	94.39 (69)	0.02	0.05 [0.02;0.08]	0.08	0.97
+RT Variability
SD RT	0.57	0.51 (0.28;0.89)	99.21 (69)	0.01	0.06 [0.03;0.08]	0.09	0.96
log(VRT)	0.58	0.51 (0.27;0.89)	96.17 (69)	0.02	0.06 [0.02;0.08]	0.09	0.97
IQR	0.57	0.46 (0.20;0.75)	110.24 (69)	0.00	0.07 [0.04;0.09]	0.08	0.93
+Errors
Error Rate	0.78	0.63 (0.41;0.75)	110.16 (69)	0.00	0.07 [0.04;0.09]	0.07	0.93
Probit (Error)	0.74	0.59 (0.40;0.70)	104.59 (69)	0.00	0.06 [0.04;0.09]	0.08	0.93

RMSEA with 95% CI; ω = McDonald’s omega.