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Table 4 Operative and PO data of patients of the four groups

From: Preoperative oral melatonin can reduce preoperative anxiety and postoperative analgesia in a dose-dependent manner

Variables Groups
P M1 M2 Z
Operative time (min)
 Mean (±SD) 42.1±9.1 43.9±8.1 41.1±8.7 41.6±9.6
 P1   0.409 0.639 0.799
 P2    0.181 0.287
 P3     0.845
PO Hospital stay (h)
 Mean (±SD) 11.4±1.9 10.6±2 9.6±1.3 10±1.8
 P1   0.088 0.00002 0.0024
 P2    0.014 0.186
 P3     0.289
Satisfaction scores
 Very satisfying 6 (17.1%) 11 (31.4%) 14 (40%) 13 (37.2%)
 Satisfying 10 (28.6%) 12 (34.2%) 12 (34.2%) 11 (31.4%)
 Good 11 (31.4%) 7 (20%) 8 (22.9%) 9 (25.7%)
 Dissatisfying 8 (22.9%) 5 (14.4%) 1 (2.9%) 2 (5.7%)
 P1 0.009
 P4   0.687
  1. Data are presented as mean±SD, numbers, and percentages. p <0.05 indicates significant difference; p>0.05 indicates non-significant difference
  2. P1 Significance of difference versus group P, P2 Significance of difference versus group M1, P3 Significance of difference versus group M2, P4 Significance of variance between P, M1, and M2 groups according to one-way ANOVA test for parametric variables and Chi-square test with Yates correction for non-parametric numerical values