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CTPA results during the two observation periods.
| Exam Result | Pre-COVID | Early COVID | Total |
|---|---|---|---|
| PE+ | 1200 (9.9%) [1292] | 1138 (11.6%) [1046] | 2338 |
| PE− | 10,906 (90.1%) [10814] | 8668 (88.4%) [8760] | 19,574 |
| Total | 12,106 | 9806 | 21,912 |
A positive PE result was more likely during the early COVID period compared to before the pandemic. The contingency table provides the following information: the observed cell totals, column percentages in parentheses, and the expected cell totals in brackets.
