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Table 2 Characteristics of patients undergoing emergency and elective surgeries on weekdays and weekends

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

EmergencyWeekday (633 days)Weekend (290 days)Total (% of samples)P-value
Total, N (%)712(75)235(25)947  
Sexb, men, N (%)317(75)104(25)421(45)0.94
Women, N (%)395(75)131(25)526(55) 
Agea, years (IQR)43(33–68)49(32–74)  <.0001
Duration of staya, days (IQR)9(6–25)11(5–32)  0.58
Time of anaesthesiaa, minutes (IQR)131(90–195)140(94–201)  0.12
Time of operationa, minutes (IQR)79(54–135)87(53–134)  0.61
ASA Classb I, N (%)338(78)98(22)436(46)0.08
II260(76)80(24)340(36) 
III89(66)45(34)134(14) 
IV23(68)11(32)34(4) 
V2(67)1(33)3(0.32) 
ElectiveWeekday (633 days)Weekend (290 days)Total (% of samples)P-value
Total, N (%)5344(82)1151(18)6495  
Sexb, men, N (%)2677(83)566(17)3664(50)0.57
Women, N (%)2667(82)585(18)3778(50) 
Agea, years (IQR)57(39–72)41(21–58)  <.0001
Duration of staya, days (IQR)7(4–15)5(2–7)  <.0001
Time of anaesthesiaa, minutes (IQR)143(99–215)111(77–154)  <.0001
Time of operationa, minutes (IQR)94(59–156)68(40–105)  <.0001
ASA Classb I, N (%)2566(77)771(23)3337(51)<.0001
II2337(87)348(13)2685(41) 
III436(93)32(7)468(7) 
IV5(100)0(0)5(0.08) 
V0 0 0(0) 
  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)