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Table 2 Degree of accuracy of blood loss estimation for the 3 phases, with p-values for the association between phase 1 and phase 2, and phase 2 and phase

From: Effect of education and clinical assessment on the accuracy of post partum blood loss estimation

  Phase P value
  P1 MD (sd) P2 MD (sd) P3 MD (sd) P1 vs P2 P2 vs P3
Station 1 (200 ml) -45.2 (93.0) 21.7 (89.5) 37.7 (119.2) <0.0001 0.16
Station 2 (225 ml) -5.2 (135.1) 59.6 (115.9) 49.2 (102.3) <0.0001 0.18
Station 3 (250 ml) -80.0 (112.0) 19.9 (97.5) 27.6 (122.0) <0.0001 0.40
Station 4 (500 ml) -115.0 (291.0) -42.1 (309.4) -52.4 (202.1) 0.05 0.70
Station 5 (550 ml) -196.6 (241.7) -44.1 (182.2) -18.0 (185.1) <0.0001 0.11
Station 6 (550 ml) -183.7 (254.4) -65.7 (237.3) -38.6 (205.5) <0.0001 0.13
Station 7 (700 ml) -227.4 (259.3) -57.9 (235.1) -14.2 (205.9) <0.0001 0.02
Station 8 (900 ml) -313.3 (317.5) -42.9 (398.0) -29.9 (360.3) <0.0001 0.66
Station 9 (1050 ml) -436.5 (505.4) -135.8 (352.3) -100.1 (342.6) <0.0001 0.18
Station 10 (2000 ml) -795.7 (729.6) -227.1 (823.4) -178.3 (634.2) <0.0001 0.36
  1. P = Phase.
  2. P-value significant ≤ 0.05.
  3. MD = Mean Difference.
  4. sd = Standard deviation.
  5. Stations were ordered in an ascending order of simulated blood loss volumes, although the sequence was random for the different phases conduction.