Table 1.
Comparison of baseline data between participants and nonparticipants.
| Variable | Participated (% of participants) | Did not participate (% of nonparticipants) | P-value | |
|---|---|---|---|---|
| Male sex | 171 (56.4%) | 112 (61.2%) | 0.30a | |
| Age at surgery | 54.7 ± 15.0 | 54.5 ±14.4 | 0.88b | |
| Years surgery to contact (IQR) | 2 (2-3) | 2 (2-5) | 0.005c | |
| Trial source (publication year) | B-Unaware (2008) | 37 (12.2%) | 46 (25.1%) | <0.001a |
| BAG-RECALL (2011) | 107 (35.3%) | 67 (36.6%) | ||
| MACS (2012) | 159 (52.5%) | 70 (38.3%) | ||
| Type of surgery | Cardiothoracic | 103 (34.0%) | 62 (33.9%) | 0.12a |
| General | 61 (20.1%) | 48 (26.2%) | ||
| Gynecologic | 39 (12.9%) | 29 (15.8%) | ||
| Urologic | 23 (7.6%) | 11 (6.0%) | ||
| ENT or maxillofacial | 19 (6.3%) | 11 (6.0%) | ||
| Orthopedic | 26 (8.6%) | 6 (3.3%) | ||
| Otherd | 31 (10.2%) | 16 (8.7%) | ||
| Had ICU stay | 115 (38.0%) | 47 (25.6%) | 0.005a | |
| Study group | End-tidal anesthetic concentration monitoring | 143 (41.2%) | 91 (49.7%) | 0.092a |
| Bispectral index monitoring | 117 (38.6%) | 78 (42.6%) | ||
| No AWR monitor | 43 (14.2%) | 14 (7.7%) | ||
| High risk for AWR | 215 (71.0%) | 146 (79.8%) | 0.033a | |
| AWR | Definite | 24 (7.9%) | 7 (3.8%) | 0.14b |
| Possible | 25 (8.3%) | 12 (6.6%) | ||
| Denied | 254 (83.8%) | 164 (89.6%) | ||
| For only those patients who reported AWR: | ||||
| MACI Class | 1 | 20 (41%) | 5 (26%) | 0.63e |
| 2 | 15 (31%) | 6 (32%) | ||
| 3 | 6 (12%) | 4 (21%) | ||
| 4 or 5 | 8 (16%) | 4 (21%) | ||
| Distressing | No | 12 (24.5%) | 9 (47.4%) | 0.026a |
| Yes | 37 (75.5%) | 10 (52.6%) | ||
Percentages may not sum to 100% because of rounding.
a
chi-square test.
b
t-test.
c
Mann-Whitney U test.
d
“Other” includes surgical categories with less than 10 total patients, such as vascular surgery, neurosurgery, cardiac electrophysiology, and other miscellaneous procedure types.
e
Fisher's exact test.
AWR = intraoperative awareness with explicit recall, ENT = ear, nose and throat surgery, ICU=intensive care unit, MACI = Michigan Awareness Classification Instrument