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Table 1 Demographic and baseline characteristics

From: The use of intrathecal morphine for acute postoperative pain in lower limb arthroplasty surgery: a survey of practice at an academic hospital

Variable   Overall n = 66 100 mcg ITM n = 29 150 mcg ITM n = 37 P-values
Gender Male 30 (45) 11 (37) 19 (63) 0.28
Female 36 (55) 18 (50) 18 (50)
Age in years < 40 7 (11) 0 (0.0) 7 (100) 0.012
40–49 5 (8) 1 (20) 4 (80)
50–59 19 (29) 10 (53) 9 (47)
60–69 23 (31) 9 (39) 14 (61)
70+ 12 (18) 9 (75) 3 (25)
Weight [median (IQR)]   74.5 (65–80) 75 (65–79) 73 (65–80) 0.81
ASA I 8 (12) 3 (38) 5 (62) 0.54
II 53 (80) 25 (47) 28 (53)
III 5 (7.58) 1 (20) 4 (80)
Surgery THR 48 (73) 23 (48) 25 (52) 0.29
TKR 18 (27) 6 (33) 12 (67)
Bupivacaine Median (IQR) 14 (13–14.5) 13 (12–14) 14 (14–15)  < 0.001
  1. ITM intrathecal morphine, THR total hip replacement, TKR total knee replacement, ASA American Society of Anaesthesiology