Table V.

Linear mixed effect model output for response variable effort fitted by REML. The following factors are considered: the interaction between gender and (1) ΔSPL mean, (2) ΔSPL standard deviation (std_ΔSPL) and (3) fundamental frequency (fo). For the intercept, for each interaction, the estimate, the standard error, the degrees of freedom, the test statistic, t and the p value are reported.

Effort	Estimate	Std. Error	df	t value	p value
(Intercept)	14.33	22.30	62	0.64	0.523
ΔSPL:Gender Female	2.67	0.57	138	4.73	<0.001***
ΔSPL:Gender Male	2.57	0.78	86	3.30	0.001**
std_ΔSPL:Gender Female	−3.45	1.46	202	−2.36	0.019*
std_ΔSPL:Gender Male	−2.06	1.73	202	−1.19	0.235
fo:Gender Female	0.25	0.11	67	2.21	0.030*
fo:Gender Male	0.29	0.16	51	1.76	0.084.

Significance Codes: ’***’<0.001 ’**’<0.01 ’*’<0.05 ’.’<0.1