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3 ± 28.7 μVs vs 67.6 ± 26.2 μVs, .001). Among those with nonstrict LBBB, mean QRSd was similar but QRSA was significantly greater among women than men (96.0 ± 25.0 μVs vs 63.6± 26.2 μVs, .001). QRSA was similar among men and women with strict LBBB ( = .533). Female sex was associated with better long-term outcomes in an unadjusted model (hazard ratio 0.623, confidence interval 0.454-0.857, = .004) but sex no longer predicted outcomes after accounting for differences in QRSA. Our study suggests that sex-specific differences in LV dyss