Table 1 Baseline Characteristics of the Learning and Validation Data Sets
Variable | Learning data set | Validation data set | ||
|---|---|---|---|---|
Nagoya n = 54 | Chutouen n = 23 | Komaki n = 10 | Maebashi n = 64 | |
Demographics | ||||
 Age, yr | 62.5 (52.0-70.0) | 67.0 (55.5-75.0) | 47.0 (27.0-51.0) | 61.0 (52.0-72.0) |
 Length of stay in hospital, d | 27.5 (17.0-52.3) | 24.0 (9.0-52.0) | 11.5 (5.8-52.5) | 30.5 (18.0-67.5) |
Condition of cardiac arrest | ||||
 Witness, n (%) | 43 (79.6) | 18 (78.3) | 8 (80.0) | 51 (79.7) |
 Bystander, n (%) | 28 (51.9) | 15 (65.2) | 4 (40.0) | 36 (56.3) |
 Initial rhythm, shockable, n (%) | 30 (55.6) | 8 (36.4) | 4 (40.0) | 45 (70.3) |
Duration of resuscitation effort, min | 20.0 (13.0-30.0) | 20.5 (11.0-39.3) | 24.0 (12.5-33.3) | 15.0 (9.0-30.0) |
Time to reach target temperature after cardiac arrest, hour | 5.0 (3.5-6.0) | 4.8 (4.0-6.8) | 6.0 (4.0-8.0) | 5.0 (3.0-8.0) |
Outcome | ||||
 Good (CPC ≤ 2), n, (%) | 23 (42.6) | 11 (47.8) | 3 (30.0) | 27 (42.2) |
 Poor (CPC ≥ 3), n, (%) | 31 (57.4) | 12 (52.2) | 7 (70.0) | 37 (57.8) |