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Table 1 Descriptive statistics, total population and the two main patient groups

From: Impact of changed management policies on operating room efficiency

Population

Variable

Period 1

Period 2

Change, %

Total

Number of days (n)

315

316

 
 

Number of patients (n)

11 372

12 143

6.8*

 

Case time (hours)

23 532

25 202

7.1*

 

Out-hours operating (hours)

5 236

5 400

3.2

Elective

Number of patients (n)

7 709

8 044

4.3*

 

Case time (hours)

16 433

16 693

1.6

 

Overtime (hours)

494

367

−26*

 

SD case time per day

1 509

1 227

 
 

Number of operating rooms (n)

17

14

 

Non - elective

Number of patients (n)

3 663

4 099

12*

 

Case time (hours)

7 099

8 509

20*

 

Case time day (hours)

2 534

3 763

48.5*

 

Case time evening (hours)

2 156

2 337

8.4*

 

Case time night (hours)

582

440

−24.4*

 

Case time weekend (hours)

1 827

1 969

7.8

 

Day shift, percentage of total case time (%)

36

44

 
 

Evening shift, percentage of total case time (%)

30

27

 
 

Night shift, percentage of total case time (%)

8

5

 
 

Weekend, percentage of total case time (%)

26

23

 
 

Number of nights without surgery (n)

55

112

 
 

SD daily case time (dayshift)

352

281

 

Total

Mean utilization 17 OR s (%)

56

-

 

Elective

Mean utilization 14 OR s (%)

-

60

 

Non - elective

Mean utilization 3 OR s (%)

-

62

 
 

Mean utilization evening (%)

48

52

 
 

Mean utilization night (%)

37

28

 
  1. Note. *p<0.05. SD = Standard Deviation. Calculations of mean OR utilization on dayshifts include weekdays with elective surgery (n = 221 and 220 in period one and two, respectively). Consequently, a total of 40 hours (period one) and 74 hours (period two) non-elective case time conducted on dayshifts without elective cases is excluded. Mean OR utilization on evenings and nights include all weekdays in the two periods; 225 days and 226 weekdays.