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Table 4 Comparison of the average of GRV after intervention in the case and control groups in different days

From: Studying the effect of abdominal massage on the gastric residual volume in patients hospitalized in intensive care units

Variables Groups Average rating Statistical test
Average of GRV after intervention in first day Case 21.52 *p < 0.001
Z = − 3/994
Control 39.48
Average of GRV after intervention in second day Case 24.53 *p = 0.008
Z = − 2.651
Control 36.47
Average of GRV after intervention in third day Case 20.25 *p < 0.001
Z = − 4.563
Control 40.75
  1. *is significant