Table 3. Results of binary logistic regression analyses, dependent variable  =  hearing improvement >10 dB, independent variables  =  GPIa receptor density and fibrinogen, n = 49^#.

	GPIa receptor density above mean		GPIa receptor density below mean		ORs (95%-CI) for GPIa receptor density within different strata of fibrinogen
	N with/without hearing improvement	OR (95% CI)	N with/without hearing improvement	OR (95% CI)
Fibrinogen above mean	1/9	1.0	5/10	1.24 (0.59 – 2.60); p = 0.568	1.24 (0.59 – 2.60); p = 0.568
Fibrinogen below mean	8/13	1.50 (0.71 – 3.14); p = 0.286	5/17	0.84 (0.29 – 2.42); p = 0.741	0.56 (0.25 – 1.24); p = 0.150

Measure of effect modification on additive scale: relative excess risk due to interaction, RERI (95% CI)  =  −0.90 (−1.97 – 0.17)

Measure of effect modification on multiplicative scale: ratio of ORs (95% CI) = 0.45 (0.21 – 0.94), p = 0.034

ORs are adjusted for smoking and vertigo, #  =  4 datasets missing due to missing covariates.