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Table 2 Measured volume for different fluid volumes and mean difference compared against the known ingested volume

From: Qualitative and quantitative gastric ultrasound assessment in highly skilled regional anesthesiologists

Actual fluid volume (ml)

Measured volume (mean ± SD)

Mean difference in volume (±SD)

Anesthesiologist 1

Anesthesiologist 2

Actual vs. Anesthesiologist 1

Actual vs. Anesthesiologist 2

Anesthesiologist 1 vs. Anesthesiologist 2

100

126.6 ± 37.8

97.3 ± 46.5

−26.6

2.7

29.3 ± 35.2

200

177.0 ± 43.0

136.7 ± 44.3

23.0

63.3

40.3 ± 33.7

300

200.4 ± 79.6

143.7 ± 18.4

99.6

156.3

56.7 ± 67.8

  1. Abbreviation: SD standard deviation