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Table 1 Population characteristics and data completeness

From: Postoperative short-term use of the nonsteroidal anti-inflammatory drug flurbiprofen did not increase the anastomotic leakage rate in patients undergoing elective gastrointestinal surgery—a retrospective cohort study

  Total study populations (n=3653) Missing data (%)
Age 61 (53–67) 0
Sex
 Male 2487 (68.08%) 0
 Female 1166 (31.92%)  
BMI 23 (20.9–25.1) 0.27
Tobacco use
 Non-smoker 1532 (60.58%) 30.19
 Previous smoker 842 (33.02%)  
 Active smoker 176 (6.90%)  
Alcohol
 Non-drinker 1822 (71.65%) 30.38
 Previous drinker 613 (24.10%)  
 Active drinker 108 (4.25%)  
Ischemic heart disease 129 (3.53%) 0
Hypertension 757 (20.72%) 0
Diabetes 338 (9.25%) 0
Respiratory system disease 31 (0.85%) 0
ASA score
 1 66 (1.81%) 0.05
 2 3160 (86.55%)  
 3 411 (11.26%)  
 4 14 (0.38%)  
Tumor stage (pTNM)
1 947 (25.92%) 0
 2 1138 (31.15%)  
 3 1541 (42.18%)  
 4 27 (0.75%)  
Procedure type   0
 Gastrectomy 2054 (56.22%)  
 Colorectomy 1599 (43.77%)  
Procedure approach
 Laparoscopic 1708 (46.76%) 0
 Open 1945 (53.24%)  
Intraoperative blood loss (ml) 100 (50–150) 0.19
Intraoperative transfusion 249 (6.82%) 0
Operating duration 3 (2.42–3.83) 0
Anastomotic leakage 57 (1.56%) 0
In-hospital mortality 2 (0.05%) 0