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Table 7 Clustering among patients of adverse occurrences reviewed independently by all four reviewers.1

From: Towards standardized measurement of adverse events in spine surgery: conceptual model and pilot evaluation

1 adverse occurrence in 22 patients
2 adverse occurrences in 9 patients
3 adverse occurrences in 7 patients
4 adverse occurrences in 6 patients
5 adverse occurrences in 5 patients
6 adverse occurrences in 1 patient
7 adverse occurrences in 1 patient
9 adverse occurrences in 2 patients
Total
141 adverse occurrences in 53 patients
  1. 1 Among the patients with an adverse occurrence, more than half (31/53) experienced multiple events. This clustering made cause, effect, and preventability judgments on individual events difficult.