Table 2. Univariate and multivariate analyses for recurrent BPPV according to MIF quartiles.

MIF quartiles*	Recurrent/all	Crude OR (95%CI), P	Multivariable-adjusted OR†
Quartile 1 (Q1)	3/39	Reference	Reference
Q2	6/39	2.18(0.51–9.43), 0.29	1.48(0.42–7.89), 0.52
Q3	10/38	4.29(1.08–17.06), 0.029	3.11(0.89–11.43), 0.18
Q4	16/38	8.73(2.28–33.41), <0.001	4.05(1.65–15.44), 0.009

^*MIF quartiles were defined as Q1 < 9.8 ng/ml, Q2 9.8–13.9 ng/ml, Q3 13.9–18.4 ng/ml and Q4 > 18.4 ng/ml.

^†Adjusted for factors including age, sex, BMI, SBP, DBP, smoking, drinking, regular exercise habit, serum levels of CRP and IL-6.