Table 4. Results of binary logistic regression analyses, dependent variable  =  hearing improvement > 10 dB, independent variables  =  GPIb receptor density and fibrinogen, n = 55^#.

	GPIb receptor density above mean		GPIb receptor density below mean		ORs (95%-CI) for GPIb 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	3/14	1.0	4/9	2.00 (1.04 – 3.86); p = 0.038	2.00 (1.04 – 3.86); p = 0.038
Fibrinogen below mean	4/15	1.28 (0.68 – 2.41); p = 0.453	10/17	2.52 (0.96 – 6.64); p = 0.061	1.98 (0.88–4.43); p = 0.098

Measure of effect modification on additive scale: relative excess risk due to interaction, RERI (95% CI)  =  0.24 (−1.46 – 1.95)

Measure of effect modification on multiplicative scale: ratio of ORs (95% CI) = 0.99 (0.52– 1.86), p = 0.968

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