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The association between the Environmental Relative Moldiness Index (ERMI) values and the corresponding “forced expiratory volume in 1 second percentage” (FEV1%) values were evaluated by plotting a B-spline regression (solid black line) using two interior quantile knots. The 95% confidence limits for the curve are shown as hatched lines. The peak FEV1% of about 100% was at an ERMI value of approximately 2.5. The FEV1% values declined to about 70% at an ERMI value of 15.
