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TABLE 5: 
Effect of hospital and physician volume on outcome
Odds of Worse Outcome at Hospital Discharge (Four-Level Scale)
Hospital volume-unruptured aneurysm coiling0.28 (0.14–0.54) P < 0.001
Hospital volume-all aneurysm coiling0.34 (0.18–0.63) P < 0.001
Hospital volume-unruptured aneurysm, coiling or clipping0.29 (0.11–0.77) P = 0.01
Hospital volume-all aneurysm, coiling or clipping0.34 (0.12–0.95) P = 0.04
Physician volume-unruptured aneurysm coiling0.11 (0.02–0.80) P = 0.03
Physician volume-all aneurysm coiling0.10 (0.02–0.63) P = 0.01
Hospital clipping-unruptured aneurysm volume0.49 (0.13–1.84) P = 0.3
Hospital clipping-any aneurysm volume0.51 (0.14–1.88) P = 0.3