Table 3 Clinical information comparisons in chest pain patients with/without previous cardiac imaging tests
|  | Chest pain patients with previous CIT performed (n = 1874) | Chest pain patients without previous CIT (n = 7545) | P value |
|---|---|---|---|
ED length of stay—min | |||
 Mean (SD) | 829.0 (870.5) | 652.9 (836.7) |  < 0.0001 |
 Median (IQR) | 487 (272, 1210) | 328 (230, 767) |  < 0.0001 |
ED disposition—n (%) | |||
 Discharged | 721 (38.5) | 4394 (58.2) |  < 0.0001 |
 Admitted | 1153 (61.5) | 3151 (41.8) |  |
HEART score—n (%) | |||
 Low risk (0–3) | 716 (38.2) | 4941 (65.5) |  < 0.0001 |
 Moderate risk (4–6) | 1081 (57.7) | 2501 (33.2) |  |
 High risk (7–10) | 77 (4.1) | 103 (1.4) |  |
 Classification accuracy rate | 85.4% (1601/1874) | 82.7% (230/278) | 0.015 |
HEART2 score—n (%) | |||
 Low risk (–1–3) | 1040 (55.5) | 4941 (65.5) |  < 0.0001 |
 Moderate risk (4–6) | 739 (39.4) | 2501 (33.2) |  |
 High risk (7–11) | 95 (5.1) | 103 (1.4) |  |
Time interval from previous CIT to the index ED visit—n (%) | |||
  < 1 year | 1130 (60.3) |  |  |
 1–2 years | 476 (25.4) |  |  |
  > 2 year | 268 (14.3) |  |  |
MACE outcomes—positive n (%) | 128 (6.8) | 278 (3.7) |  < 0.0001 |