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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
II2597(86)428(14)3025(41) 
III525(87)77(13)602(8) 
IV28(72)11(28)39(0.5) 
V2(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)