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Table 1 Summary of ICU characteristics, stratified by time of ICU admission

From: Association between afterhours admission to the intensive care unit, strained capacity, and mortality: a retrospective cohort study

Characteristic

Total

(n = 12,265, 100%)

Workhours (n = 8014, 65.3%)

Afterhours

(n = 4251, 34.7%)

p value

Location, n (%)

   

0.012

 Calgary

6732 (54.9)

4333 (54.1)

2399 (56.4)

 

 Edmonton

5533 (45.1)

3681 (45.9)

1852 (43.6)

 

Hospital type

   

0.0009

 Academic

5776 (47.1)

3676 (45.9)

2100 (49.4)

 

 Tertiary

3664 (29.9)

1895 (23.7)

930 (21.9)

 

 Community

2825 (23.0)

2443 (30.5)

1221 (28.7)

 

ICU, n (%)

   

< 0.0001

 Academic 1

3083 (25.1)

1918 (23.9)

1165 (27.4)

 

 Community 1

333 (2.7)

233 (2.9)

100 (2.4)

 

 Community 2

303 (2.5)

222 (2.8)

81 (1.9)

 

 Tertiary 1

1728 (14.1)

1150 (14.3)

578 (13.6)

 

 Tertiary 2

1936 (15.8)

1293 (16.1)

643 (15.1)

 

 Community 3

1258 (10.3)

824 (10.3)

434 (10.2)

 

 Community 4

268 (2.2)

175 (2.2)

93 (2.2)

 

 Community 5

663 (5.4)

441 (5.5)

222 (5.2)

 

 Academic 2

2693 (22.0)

1758 (21.9)

935 (22.0)

 

Number of ICU beds, median (IQR)

24 (18–28)

24 (10–28)

25 (18–28)

0.0001

Admitted/transferred from

   

< 0.0001

 Emergency department

4823 (39.3)

2851 (35.6)

1972 (46.4)

 

 PACU/operating theater

2398 (19.6)

1680 (21.0)

718 (16.9)

 

 Post procedurea

44 (0.4)

38 (0.5)

6 (0.1)

 

 Other critical care unit

313 (2.6)

238 (3.0)

75 (0.2)

 

 Ward transfer

3681 (30.0)

2528 (31.5)

1153 (27.1)

 

 Outside hospital

428 (3.5)

268 (3.3)

160 (3.8)

 

 Otherb

358 (2.9)

263 (3.3)

95 (2.2)

 

 Unspecifiedc

221 (1.8)

149 (1.9)

72 (1.7)

 

Admitted on weekend/holiday

3471 (28.3)

2169 (27.1)

1302 (30.6)

< 0.0001

Admitted during winter (October–March)

5799 (47.3)

3801 (47.4)

1998 (47.0)

0.66

Bed occupancy rate, median (IQR)

85.7 (79.9–92.3)

85.7 (76.0–92.3)

86.7 (77.8–92.3)

0.040

 Occupancy < 90%, n (%)

7828 (63.8)

5141 (64.2)

2687 (63.2)

0.20

 Occupancy ≥ 90%, n (%)

4177 (34.1)

2694 (33.6)

1483 (34.9)

0.20

Clustering of admissions, per bedd

 Clustering admission per bed < 0.15

10,252 (83.6)

6586 (82.2)

3666 (86.2)

< 0.0001

 Clustering admission per bed ≥ 0.15

2013 (16.4)

1428 (17.8)

585 (13.8)

< 0.0001

  1. ICU intensive care unit, IQR interquartile range, PACU postanesthetic care unit
  2. aUnplanned admissions following bronchoscopy, endoscopy, cardiac catheterization, interventional radiology, etc.
  3. bPatients’ admission source classified by admitting physician as “other”
  4. cUnspecified data points were unavailable in our database
  5. dNumber of admissions in the 2 h before or after the index admission, divided by the number of funded ICU beds
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Critical Care

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