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Table 1 Demographics and preoperative 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*
Age 31 72.8 ± 5.8 54 74.5 ± 6.5 0.23
Gender 31   54   0.95
Female   18 (58%)   31 (57%)  
Male   13 (42%)   23 (43%)  
Race 31   54   0.84
White   23 (74%)   39 (72%)  
Non-white   8 (26%)   15 (28%)  
Education 30   52   0.17
Less than college   12 (40%)   29 (56%)  
College or above   18 (60%)   23 (44%)  
History of CNS disorders 31 18 (58%) 52 35 (67%) 0.40
Daily Alcohol 31   53   0.57
< 2 drinks   24 (77%)   38 (72%)  
≥ 2 drinks   7 (23%)   15 (28%)  
TICS Scores 28 33.1 ± 5.8 47 31.0 ± 3.8 0.09
(mean ± SD)      
GDS 30 3.1 ± 3.0 48 3.2 ± 2.7 0.93
(mean ± SD)      
ASA 31   54   0.01
1 and 2   8 (26%)   29 (54%)  
≥ 3   23 (74%)   25 (46%)  
Use of preoperative opioids 30 15 (50%) 53 17 (32%) 0.11
Use of preoperative benzodiazepine 30 5 (17%) 53 8 (15%) 0.85
Preoperative pain level 31 3.7 ± 3.2 52 2.5 ± 2.7 0.07
  1. ASA = American Society of Anesthesiologists. CNS = central nervous system. GDS = geriatric depression scale. SD = standard deviation. TICS = Telephone Interview for Cognitive Status
  2. For a continuous variable, the numbers in parenthesis are the range of the variable
  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 the cell count was less than 5, Fisher's exact test was used; and iii) Mantel-Haenszel chi-square test was used for the ordinal variables