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Table 5 Severity and preventability of adverse events

From: Is detection of adverse events affected by record review methodology? an evaluation of the “Harvard Medical Practice Study” method and the “Global Trigger Tool”

Category of harm HMPS method HMPS method after review stage 2 HMPS method after review stage 3
  n(%) of AEs n(%) of preventable AEs n(%) of AEs n(%) of preventable AEs
Minimal impairment, recovery within 1 month 116 (76.8) 104 (89.7) 120 (77.4) 108 (90.0)
Moderate impairment, recovery within 1 to 6 months 20 (13.2) 17 (85.0) 20 (12.9) 17 (85.0)
Moderate impairment, recovery within 6 to 12 months 9 (6.0) 6 (66.7) 9 (5.8) 6 (66.7)
Permanent impairment, degree of disability <50% 4 (2.6) 3 (75.0) 4 (2.6) 3 (75.0)
Permanent impairment, degree of disability >50% 1 (0.7) 1 (100.0) 1 (0.6) 1 (100.0)
Contributed to patient death 1 (0.7) 0 (0.0) 1 (0.6) 0 (0.0)
Unable to determine 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0)
Total n of AE 151 (100.0) 131 (86.8) 155 (100.0) 135 (87.1)
Category of harm GTT GTT after review stage 2 GTT after review stage 3
  n (%) of AEs n (%) of preventable AEs n (%) of AEs n (%) of preventable AEs
E Contributed to or resulted in temporary harm to the patient and required intervention 51 (51.5) 41 (80.4) 78 (56.9) 63 (80.8)
F Contributed to or resulted in temporary harm to the patient and required initial or prolonged hospitalisation 42 (42.4) 31 (73.8) 51 (37.2) 40 (78.4)
G Contributed to or caused permanent patient harm 5 (5.1) 5 (100.0) 7 (5.1) 7 (100.0)
H Intervention required to sustain life 1 (1.0) 0 (0.0) 1 (0.7) 0 (0.0)
I Contributed to patient death 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0)
Total n of AE 99 (100.0) 77 (77.8) 137 (100.0) 110 (80.3)
  1. AE, adverse events; HMPS, “Harvard Medical Practice Study”; GTT, “Global Trigger Tool”.