TABLE 2.

Effect size calculations for differences between the two participant groups in each condition for performance on the speech recognition task and dual-task postural control (CoP)

	Speech Recognition	Postural Control
Normal stance
RFL 0 speech	1.06	0.46
RFL –6 speech	0.63	0.74
RFL 0 noise	0.52	0.63
RFL –6 noise	0.61	0.64
FFF 0 speech	0.47	0.80
FFF –6 speech	0.49	0.54
FFF 0 noise	0.32	0.63
FFF –6 noise	0.23	0.13
Tandem stance
RFL 0 speech	0.44	0.74
RFL –6 speech	0.91	0.45
RFL 0 noise	0.50	0.66
RFL –6 noise	1.12	0.94
FFF 0 speech	0.31	0.54
FFF –6 speech	0.16	0.95
FFF 0 noise	0.40	0.52
FFF –6 noise	0.19	0.39

Cohen’s d was used to calculate effect size for speech recognition scores. Hedge’s g was used to derive effect sizes for CoP data due to the large difference in variance between groups when postural control was measured in tandem stance. Condition is specified by spatial configuration (RFL = spatially-separated target and masker, FFF = spatially co-located target and masker); SNR (0 = 0 dB, 6 = −6 dB); masker type (speech or noise); and stance (normal or tandem). Effect size greater than 0.80 is considered to be large; effect sizes around 0.50 are considered medium; and effect sizes less than 0.40 are considered small.