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Table 1 Characteristics of the study population

From: Staffing level: a determinant of late-onset ventilator-associated pneumonia

Characteristic

Total population

Patients with VAP

Patients without VAP

Number of patients

936

209

727

Age (years)

65 (50 to 75)

64 (54 to 74)

65 (48 to 75)

Male sex

552 (59.0)

125 (59.8)

427 (58.7)

Charlson score at admissiona

   

   0

335 (35.8)

69 (33.0)

266 (36.6)

   1 to 2

326 (34.8)

91 (43.5)

235 (32.3)

   3 to 5

184 (19.7)

34 (16.3)

150 (20.6)

   > 5

91 (9.7)

15 (7.2)

76 (10.5)

APACHE II score at admissionb

   

   < 26

367 (40.3)

74 (37.2)

293 (41.2)

   26 to 30

170 (18.7)

37 (18.6)

133 (18.7)

   > 30

373 (41.0)

88 (44.2)

285 (40.1)

Nursing acuity score at admission

226 (199 to 226)

226 (200 to 226)

226 (196 to 226)

Admission diagnosis

   

   Infectious diseasea

238 (25.4)

70 (33.5)

168 (23.1)

   Cardiovascular condition

315 (33.7)

76 (36.4)

239 (32.9)

   Pulmonary disease

139 (14.9)

27 (12.9)

112 (15.4)

   Othera

244 (26.1)

36 (17.2)

208 (28.6)

ICU stay (days)a

6 (3 to 11)

15 (10 to 23)

5 (3 to 8)

Duration of mechanical ventilation (days)a

3 (2 to 8)

11 (6 to 19)

3 (2 to 6)

ICU mortality

297 (31.7)

70 (33.5)

227 (31.2)

Hospital stay (days)a

18 (7 to 38)

29 (17 to 67)

14 (5 to 32)

Hospital mortality

381 (40.7)

94 (45.0)

287 (39.5)

  1. Values are expressed as numbers (%) or median (interquartile range) for continuous variables. aSignificant difference between patients with and without VAP (P < 0.05). bTwenty-six missing values. APACHE, Acute Physiology and Chronic Health Evaluation; ICU, intensive care unit; VAP, ventilator-associated pneumonia.