Table 3.

Parameter estimates for non-linear regression used to estimate transfer functions for each age group.

				95% Confidence interval
Age group	Parameter	Estimate	Std. error	Lower	Upper
Adults	Q	0.352	0.013	0.326	0.377
	N	−1.830	0.036	−1.900	−1.760
Older	Q	0.450	0.011	0.428	0.471
	N	−1.918	0.019	−1.956	−1.881
Younger	Q	0.570	0.015	0.539	0.600
	N	−1.987	0.019	−2.022	−1.953