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Table 3 Data on the surgical operations depending on high or low fluid retention index (FRI) prior to anaesthesia induction

From: Preoperative fluid retention increases blood loss during major open abdominal surgery

Parameter FRI < 3.5 (n = 61) FRI ≥ 3.5 (n = 36) Statistics
Blood loss (ml)
 Gynaecology (n = 27) 175 (100–300) 200 (113–513) P < 0.03
 Upper GI surgery (n = 27) 225 (50–575) 250 (63–725)
 Lower GI surgery (n = 31) 150 (81–375) 525 (150–1000)
 Urology (n = 12) 1000 (100–1800) 850 (500–1300)
Blood loss/operating time (ml/h)
 Gynaecology 120 (44–148) 106 (79–163) P < 0.03
 Upper GI surgery 55 (29–145) 129 (72–282)
 Lower GI surgery 57 (32–120) 84 (42–217)
 Urology 164 (71–248) 204 (171–229)
Total fluid balance (ml)
 Gynaecology 1361 (1032–1740) 1674 (1395–2210) P < 0.03
 Upper GI surgery 1569 (1362–2095) 1778 (1372–2887)
 Lower GI surgery 1506 (1014–2047) 1913 (1537–2194)
 Urology 1559 (560–1814) 2122 (1489–2938)
Fluid balance in blood units (ml)
 Gynaecology 915 (791–1113) 1186 (818–1577) P < 0.02
 Upper GI surgery 1105 (858–1467) 1223 (902–1455)
 Lower GI surgery 954 (690–1456) 1266 (1172–1447)
 Urology 845 (413–1214) 1289 (1063–1542)
  1. Two-way analysis of variance was performed on ln-transformed data using the type of surgery and FRI ≥ 3.5 as predictors. The levels of significance for FRI ≥ 3.5 are shown