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Table 1 Characteristics of patients admissions to intensive care unit, by type of unit

From: Performance of the pediatric index of mortality 2 (PIM-2) in cardiac and mixed intensive care units in a tertiary children’s referral hospital in Italy

  CICU PICU 1 PICU 2 PICU 3   Total
(N. 1,356) (N. 538) (N. 697) (N. 321)   (N. 2,912)
N % N % N % N % P-value N %
Gender          < 0.001   
Male 743 54.9 300 56.2 436 62.6 137 43.0   1,616 55.7
Female 611 45.1 234 43.8 261 37.5 182 557.0   1,288 44.3
Age class          < 0.001   
Newborn (0-7d) 188 13.9 20 3.7 43 6.2 0 0.0   251 8.6
Neonate (8–30 d) 125 9.2 12 2.3 35 5.0 3 0.9   175 6.0
Infant (1–12 m) 409 30.2 141 26.2 214 26.3 49 15.2   813 27.9
Preschool (1–5 y) 378 27.9 204 37.9 256 27.9 79 24.6   917 31.5
School (6–12 y) 170 12.5 112 20.8 81 18.7 70 21.8   433 14.9
Adolescent (13-16y) 86 6.3 49 9.1 68 21.1 120 37.4   323 11.1
Elective admissions in PICU/CICU          < 0.001   
No 171 12.6 333 61.9 389 55.8 66 20.6   959 32.9
Yes 1185 87.4 205 38.1 308 44.2 255 79.4   1,953 67.1
Main reason for PICU/CICU admission        < 0.001     
Cardiac surgical 1100 81.1 12 2.2 20 2.9 8 2.5   1,140 39.2
Other surgical 106 7.8 248 46.1 349 50.1 249 77.6   952 32.7
Medical 150 11.1 278 51.7 328 47.1 64 19.9   820 28.2
Length of stay in PICU/CICU Median (Range) 2 (0.0 – 564.0) 3 (0.0; 220.0) 3 (0.0; 111.0) 1 (0.0 – 365.0) < 0.001 2 (0.0 – 564.0)
Main Diagnosis at Hospital discharge          < 0.001   
Congenital anomalies and other diseases of the circulatory system 1,229 90.6 41 7.6 34 4.9 9 2.8   1,313 45.1
Diseases of the respiratory system 18 1.3 169 31.4 201 28.2 78 24.3   466 16.0
Diseases of the nervous system of the sense organs 5 0.4 38 7.1 128 18.4 16 5.0   187 6.4
Injury and poisoning 67 4.9 13 2.4 90 12.9 4 1.3   174 5.6
Diseases of the musculoskeletal system and connective tissue 1 0.1 0 0.0 0 0.0 127 39.6   128 4.4
Diseases of the digestive system 4 0.3 55 10.2 23 3.3 28 8.7   110 3.8
Infectious and parasitic diseases 1 0.1 13 2.4 11 1.6 0 0   25 0.9
Congenital anomalies other than circulatory system 8 0.6 56 10.4 54 7.8 33 10.3   151 5.2
Cancer 6 0.4 69 12.8 69 9.9 12 3.7   156 5.4
Other 17 1.3 84 15.6 87 12.5 14 4.4   202 6.9