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Table 2 Intraoperative and postoperative data

From: Does using a femoral nerve block for total knee replacement decrease postoperative delirium?

  Femoral Block ± PCA PCA only  
  N1 Mean ± SD or N (%) N2 Mean ± SD or N P*
Anesthesia 31 14 (45%) 54 27 (50%) 0.67
General   14 (45%)   27 (50%)  
Regional   17 (55%)   27 (50%)  
Intraoperative fentanyl dose (mcg) †** 31 171.3 ± 160.8 53 259.9 ± 185.5 0.03
Length of hospital stay (days) 29 5.7 ± 6.4 52 5.0 ± 1.9 0.58
Altered sleep-wake cycle on POD1 30 10 (33%) 51 25 (49%) 0.17
Pain at rest on POD 1 31 4.6 ± 3.0 53 4.5 ± 2.9 0.89
Change in pain level, preop and POD1 31 0.9 ± 3.2 52 1.9 ± 3.7 0.20
Benzodiazepine use on POD 1 31 2 (6%) 54 9 (17%) 0.18
Hydromorphone dose on POD1(mg)** 31 4.3 ± 4.6 54 5.9 ± 6.1 0.24
Delirium on POD 1 or POD2 28 7 (25%) 51 31 (61%) 0.002
  1. POD = postoperative day. Preop = preoperative. SD = standard deviation For a continuous variable, the numbers in parenthesis are the range of the variable
  2. Intraoperative opioid: the amount of intravenous fentanyl administered intraoperatively
  3. *For P-value, i) one-way ANOVA was used for the continuous variables; ii) Chi-square test was used for the categorical variables. If a cell count was less than 5, Fisher's exact test was used. **Wilcoxon non-parametric test was used