Table 3. Partial correlations between intelligence and time-estimation error for five different tone durations.

	Tone durations in milliseconds
Intelligence tests	100	200	500	1000	3000
Arithmetic	−.26 (.000)	−.24 (.001)	−.23 (.001)	−.27 (.000)	−.18 (.010)
Self-rated math skill	−.29 (.000)	−.28 (.000)	−.27 (.000)	−.15 (.031)	−.06 (.380)
Digit span forward	−.06 (.392)	−.06 (.367)	−.10 (.142)	−.10 (.171)	−.05 (.488)
Digit span backward	.04 (.602)	.05 (.490)	.04 (.536)	.01 (.924)	−.04 (.561)
Similarities	.08 (.289)	.07 (.338)	.07 (.307)	.08 (.285)	.01 (.933)

Note. For arithmetic and self-rated mathematical skill, all measures of non-mathematical intelligence (digit span forward, digit span backward, and similarities) were partialled out (df = 196). For the non-mathematical intelligence measures, both arithmetic and self-rated mathematical skill were partialled out (df = 197).