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Table 1 The characteristic data

From: The 50% effective dose of hydromorphone and morphine for epidural analgesia in the hemorrhoidectomy: a double-blind, sequential dose-finding study

Patient characteristics

Morphine

(n = 40)

Hydromorphone

(n = 40)

P value

Patient sex(n, %)∗

  

0.654

female

20(50)

22(55)

 

male

20(50)

18(45)

 

ASA physical status (n, %)∗

  

ns

1

17(42.5)

17(42.5)

 

2

23(57.5)

23(57.5)

 

Age (mean, yr)

41.75 ± 9.16

39.53 ± 7.71

0.244

Height (mean, cm)

164.4 ± 8.17

162.4 ± 9.04

0.308

Weight (mean, kg)

61.78 ± 9.64

59.41 ± 9.00

0.261

BMI (mean, kg/m2)

22.68 ± 2.56

22.41 ± 2.55

0.630

  1. Note: Data are presented as mean ± SD and frequency
  2. Abbreviations: BMI, body mass index; ASA, American Society of Anesthesiologists status
  3. ∗Data are numbers (%)