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Erratum

        Isogai T, Yasunaga H, Matsui H, et al. Effectiveness of Inferior Vena Cava Filters on Mortality as an Adjuvant to Antithrombotic Therapy. Am J Med. 2015;128:312.e23-312.e31
        Table 1Patient Characteristics in the Unmatched and Propensity Score-Matched Patients
        Unmatched Patients
        An absolute standardized difference of >10 indicates significant imbalance of a baseline covariate.
        Absolute Standardized Difference
        Propensity Score-matched Patients
        An absolute standardized difference of >10 indicates significant imbalance of a baseline covariate.
        Absolute Standardized Difference
        Filter Group (n = 3948)No-filter Group (n = 9177)Filter Group (n = 3474)No-filter Group (n = 3474)
        Age (y)
         ≤40300 (7.6)635 (6.9)2.6246 (7.1)243 (7.0)0.3
         41-601037 (26.3)2063 (22.5)8.8888 (25.6)859 (24.7)1.9
         61-802002 (50.7)4621 (50.4)0.71775 (51.1)1774 (51.1)0.1
         ≥81609 (15.4)1858 (20.2)12.6565 (16.3)598 (17.2)2.5
        Sex
         Male1889 (47.8)3468 (37.8)20.41584 (45.6)1575 (45.3)0.5
         Female2059 (52.2)5709 (62.2)1890 (54.4)1899 (54.7)
        Comorbidities at admission
         Charlson comorbidity index
        01552 (39.3)3575 (39.0)0.71363 (39.2)1362 (39.2)0.1
        11075 (27.2)2576 (28.1)1.9941 (27.1)918 (26.4)1.5
        2729 (18.5)1632 (17.8)1.8637 (18.3)647 (18.6)0.7
        ≥3592 (15.0)1394 (15.2)0.5533 (15.3)547 (15.7)1.1
         Deep vein thrombosis
        Lower extremities2507 (63.5)3215 (35.0)59.42060 (59.3)2043 (58.8)1.0
        Vena cava or renal veins48 (1.2)24 (0.3)11.221 (0.6)22 (0.6)0.4
        Unspecified sites15 (0.4)39 (0.4)0.715 (0.4)13 (0.4)0.9
        None1378 (34.9)5899 (64.3)61.51378 (39.7)1396 (40.2)1.1
        Status associated with severe pulmonary embolism at admission
         Mechanical ventilation on the day of admission39 (1.0)95 (1.0)0.537 (1.1)19 (0.5)5.8
         Catecholamine use on the day of admission59 (1.5)121 (1.3)1.551 (1.5)42 (1.2)2.3
        Therapeutic procedures during hospitalization
         Thrombolytic therapy1627 (41.2)2011 (21.9)42.41191 (34.3)1207 (34.7)1.0
         Pulmonary embolectomy26 (0.7)64 (0.7)0.522 (0.6)11 (0.3)4.6
        Type of hospital
         Academic hospital903 (22.9)2188 (23.8)2.3796 (22.9)789 (22.7)0.5
         Nonacademic hospital3045 (77.1)6989 (76.2)2678 (77.1)2685 (77.3)
        Numbers are n (%).
        An absolute standardized difference of >10 indicates significant imbalance of a baseline covariate.
        Table 2Propensity Score Analyses of Relative Risk of In-Hospital Mortality in the Filter Group Versus the No-filter Group
        Filter GroupNo-filter GroupPRisk Ratio (95% CI)Risk Difference (95% CI)NNT (95% CI)
        No. of Deaths / Total No.%No. of Deaths / Total No.%
        Unadjusted (n = 13,125)97/39482.5%522/91775.7%<.0010.43 (0.35-0.53)−3.2% (−3.9% to −2.6%)31 (26-39)
        1:1 Propensity score-matched (n = 6948)91/34742.6%164/34744.7%<.0010.55 (0.43-0.71)−2.1% (−3.0% to −1.2%)48 (34-82)
        Inverse probability of treatment weighting (n = 26,230)354/13,1062.7%704/13,1245.4%<.0010.50 (0.44-0.57)−2.7% (−3.1% to −2.2%)38 (32-46)
        CI = confidence interval; NNT = number needed to treat.

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