Table 1.

Relationship between decline in NEI VFQ-25 score for piecewise regression analysis for each 1 dB decline in BEMD score.

BEMD (dB)	N	Slope (95% confidence interval)	Standard error	p value
+2 to −5 (yellow)	475	2.3 (1.5, 3.0)	0.40	<0.001
−5 to −15 (green)	132	1.1 (−0.3, 2.5)	0.70	0.14
<−15 (red)	29	4.6 (1.2, 8.0)	1.64	0.009