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Table 2 Patient demographics

From: Plasma substance P concentrations in patients undergoing general anesthesia: an objective marker associated with postoperative nausea and vomiting

  PONV(-) group PONV(+) group
Patients n = 14 n = 9
Duration of anesthesia, min 168 ± 29 159 ± 30
Intraoperative remifentanil, mg 1.9 ± 0.7 2.0 ± 0.4
Blood loss, mL 41 ± 10 50 ± 50
Fluid volume, mL 918 ± 183 866 ± 313
Risk factor   
 Tobacco use (n) 3/14 1/9
 History of motion sickness (n) 3/14 4/9
 Postoperative opioids (n) 4/14 5/9
 Woman (n) 14/14 9/9
Apfel score (0/1/2/3/4) 0/1/9/3/1 0/0/2/6/1
Analgesics used postoperatively   
 Diclofenac 5 ± 13 9 ± 12
 Flurbiprofen axetil 20 ± 42 18 ± 32
 Pentazocine 3 ± 8 3 ± 18
  1. Data are expressed as mean ± SD (range) or number of patients
  2. PONV postoperative nausea and vomiting