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. Author manuscript; available in PMC: 2021 Mar 1.
Published in final edited form as: World Neurosurg. 2019 Dec 17;135:e418–e423. doi: 10.1016/j.wneu.2019.12.011

Table 2:

Univariable analysis of factors associated with single and multiple surgical procedures in subdural hematoma patients

No surgery (N=2055) Any surgery (N=1860) p-value Single surgery (N=1761) Multiple surgeries (N=99) p-value
Age in years, median (IQR) 76 (64, 84) 71 (62, 80) <0.0001 71 (63, 80) 73 (61, 81) 0.96
Race, N (%)
    White 1410 (68.7) 1214 (65.4) 1139 (64.8) 75 (75.8)
    Black 287 (14.0) 253 (13.6) 0.01 245 (13.9) 8 (8.1) 0.07
    Other 356 (17.3) 390 (21) 374 (21.3) 16 (16.2)
    Unknown 2 (0.1) 3 (0.2) 3 (0.2) 0
Sex, N (%)
    Female 882 (42.9) 551 (29.6) <0.0001 519 (29.5) 32 (32.3) 0.54
    Male 1173 (57.1) 1309 (70.4) 1242 (70.3) 67 (67.7)
Care setting, N (%)
    Nonacademic 905 (44) 780 (41.9) 0.18 739 (42) 41 (41.4) 0.92
    Academic 1150 (56) 1080 (58.1) 1022 (58) 58 (58.6)
Region of United States, N (%)
    Midwest 405 (19.7) 324 (17.4) 308 (17.5) 16 (16.2)
    Northeast 362 (17.6) 297 (16) 0.0007 284 (16.1) 13 (13.1) 0.81
    South 1073 (52.2) 970 (52.2) 916 (52) 54 (54.6)
    West 215 (10.5) 269 (14.5) 253 (14.4) 16 (16.2)
Initial Surgery, N (%)
    Burr Hole N/A 1614 (86.8) N/A 1522 (81.8) 92 (5) 0.067
    Craniotomy/craniectomy N/A 246 (13.2) 239 (12.8) 7 (0.4)