Table 5.

Relationship between mean Spectrum Level and Median Frequency.

Direction	Condition	Equation	R2	Slope different from zero	Difference between conditions
ML	EC foam	y = 0.004 x + 0.002	0.09	p = 0.2	EC foam vs. EO foam: p = 0.21 EC foam vs. EC solid: p = 0.11 EC foam vs. EO solid: p = 0.28
	EO foam	y = −0.0005 x + 0.001	0.009	p = 0.6	EO foam vs. EC foam: p = 0.70 EO foam vs. EC solid: p = 0.51 EO foam vs. EO solid: p = 0.64
	EC solid	y = −0.001 x + 0.0006	0.24	p < 0.05	EC solid vs. EC foam: p = 0.11 EC solid vs. EO foam: p = 0.69 EC solid vs. EO solid: p = 0.17
	EO solid	y = −0.00005 x + 0.0003	0.00004	p = 0.93	EO solid vs. EC foam: p = 0.28 EO solid vs. EO foam: p = 0.74 EO solid vs. EC solid: p = 0.17
AP	EC foam	y = 0.009 x + 0.002	0.19	p = 0.05	EC foam vs. EO foam: p = 0.55 EC foam vs. EC solid: p < 0.05 EC foam vs. EO solid: p = 0.21
	EO foam	y = 0.003 x + 0.0014	0.02	p = 0.56	EO foam vs. EC foam: p = 0.55 EO foam vs. EC solid: p = 0.25 EO foam vs. EO solid: p = 0.58
	EC solid	y = −0.004 x + 0.0015	0.10	p = 0.16	EC solid vs. EC foam: p < 0.05 EC solid vs. EO foam: p = 0.25 EC solid vs. EO solid: p = 0.58
	EO solid	y = −0.0008 x + 0.001	0.001	p = 0.87	EO solid vs. EC foam: p = 0.21 EO solid vs. EO foam: p = 0.58 EO solid vs. EC solid: p = 0.58