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Table 1 Characteristics of patients undergoing surgery on weekdays and weekends

From: Seven-day services in surgery and the “weekend effect” at a Japanese teaching hospital: a retrospective cohort study

Total, N (%)

Weekday (633 days)

Weekend (290 days)

Total (% of samples)

P-value

6056

(81)

1386

(19)

7442

  

Number of surgeries per daya, N (IQR)

10

(8–12)

5

(3–6)

  

<.0001

Sexb, men, N (%)

2994

(82)

670

(18)

3664

(49)

0.45

Women, N (%)

3062

(81)

716

(19)

3778

(51)

 

Agea, years (IQR)

56

(38–72)

41

(24–61)

  

<.0001

Duration of staya, days (IQR)

7

(4–16)

5

(2–8)

  

<.0001

Time of anaesthesiaa, minutes (IQR)

142

(97–211)

115

(80–163)

  

<.0001

Time of operationa, minutes (IQR)

92

(58–153)

70

(42–108)

  

<.0001

Emergencyb, N (%)

712

(75)

235

(25)

947

(13)

<.0001

Elective, N (%)

5344

(82)

1151

(18)

6495

(87)

 

ASA Classb I, N (%)

2904

(77)

869

(23)

3773

(51)

<.0001

II

2597

(86)

428

(14)

3025

(41)

 

III

525

(87)

77

(13)

602

(8)

 

IV

28

(72)

11

(28)

39

(0.5)

 

V

2

(67)

1

(33)

3

(0.04)

 
  1. Values are median (interquartile ranges; IQR) or number (proportion)
  2. Statistical analyses were performed using the Mann–Whitney U test(a) or the chi-square test(b)