Predictors of lower (ΔMD <−1 dB) and higher (ΔMD >1 dB) than expected sensitivity were identified with multinomial logistic mixed-effects regression models with a random intercept for patients and a random intercept for eyes to account for the correlations at the patient and eye level. In these models, the dependent variable was the category of ΔMD (−1 dB ≤ ΔMD ≤1 dB, ΔMD <−1 dB, or ΔMD >1 dB); the reference group for the dependent variable was the |ΔMD| ≤1 group (i.e., the group with observed MD close to that predicted). The independent variables included age, day of the week, quarter of the year, time of day, and the interaction terms between the baseline severity of VF loss and FLs, FPs, FNs, and TD to account for the fact that the effects of FL, FP, FN, and TD on ΔMD vary by the severity of VF loss. Relative risk (RR) was calculated for the effect of each factor on ΔMD reliability assuming all other factors are held constant. For FP, FN, and FL, the RRs were calculated per 10% increase in abnormal catch trials. For TD, the RRs were calculated per 1-minute increase in TD. All statistical analyses were performed in STATA statistical software: release 14 (StataCorp LP, College Station, TX).