Skip to main content

Table 1 Baseline characteristics of participants

From: Anemia and perioperative mortality in non-cardiac surgery patients: a secondary analysis based on a single-center retrospective study

 FULL COHORT
(N =85 989)
Propensity Score–Matched Cohort
(n = 17 714)
ANEMIA
CATEGORY
NONE OR MILDMODERATE OR SEVERESD
(100%)
NONE OR MILDMODERATE OR SEVERESD
(100%)
N7516310826 88578857 
AGE (years)52.456 ± 16.45658.142 ± 17.29533.7%60.41 ± 15.9459.23 ± 16.497.0%
sex  33.2%  9.0%
Male35907 (47.772%)3435 (31.729%) 2672 (30.17%)3061 (34.56%) 
Female39256 (52.228%)7391 (68.271%) 6185 (69.83%)5796 (65.44%) 
RACE  14.3%  10.0%
Chinese54347 (72.309%)7448 (68.797%) 6267 (70.76%)6247 (70.53%) 
Indian6570 (8.741%)976 (9.015%) 666 (7.52%)774 (8.74%) 
Malay7014 (9.332%)1489 (13.754%) 1002 (11.31%)1132 (12.78%) 
Others7228 (9.617%)913 (8.433%) 922 (10.41%)704 (7.95%) 
PREOP-EGFR69.304-104.53727.641-106.59026.5%42.39-98.4428.36-107.443.0%
RDW N (%)  99.4%  56.0%
RDW≤15.769383 (92.310%)6013 (55.542%) 7373 (83.24%)5263 (59.42%) 
RDW>15.73765 (5.009%)4659 (43.035%) 1426 (16.10%)3569 (40.30%) 
NA2015 (2.681%)154 (1.423%) 58 (0.65%)25 (0.28%) 
Preop-transfusion with in 30days n(%)41.9%  3.0%
0 units74439 (99.037%)9690 (89.507%) 8247 (93.11%)8208 (92.67%) 
1 unit410 (0.545%)597 (5.515%) 340 (3.84%)339 (3.83%) 
2 or more units314 (0.418%)539 (4.979%) 270 (3.05%)310 (3.50%) 
Intraop-transfusion68.1%  2.0%
0 units72917 (97.012%)8063 (74.478%) 7105 (80.22%)7170 (80.95%) 
1 unit2246 (2.988%)2763 (25.522%) 1752 (19.78%)1687 (19.05%) 
CVA CATEGORY  13.1%  2.0%
NO51068 (67.943%)7133 (65.888%) 5819 (65.70%)5864 (66.21%) 
YES1142 (1.519%)386 (3.565%) 302 (3.41%)325 (3.67%) 
NA22953 (30.538%)3307 (30.547%) 2736 (30.89%)2668 (30.12%) 
CHF CATEGORY  17.2%  4.0%
NO53543 (71.236%)7415 (68.493%) 6114 (69.03%)6132 (69.23%) 
YES475 (0.632%)308 (2.845%) 191 (2.16%)247 (2.79%) 
NA21145 (28.132%)3103 (28.662%) 2552 (28.81%)2478 (27.98%) 
IHD CATEGORY  22.9%  4.0%
NO48887 (65.041%)6416 (59.265%) 5248 (59.25%)5252 (59.30%) 
YES3128 (4.162%)1068 (9.865%) 816 (9.21%)909 (10.26%) 
NA23148 (30.797%)3342 (30.870%) 2793 (31.53%)2696 (30.44%) 
DM CATEGORY  25.7%  13.0%
NO52257 (69.525%)6909 (63.819%) 5868 (66.25%)5711 (64.48%) 
YES1262 (1.679%)723 (6.678%) 342 (3.86%)607 (6.85%) 
NA21644 (28.796%)3194 (29.503%) 2647 (29.89%)2539 (28.67%) 
Anesthesia type n(%)17.7%  5.0%
ga63448 (84.414%)8389 (77.489%) 6805 (76.83%)6989 (78.91%) 
ra11715 (15.586%)2437 (22.511%) 2052 (23.17%)1868 (21.09%) 
Priority of surgery n(%)33.2%  8.0%
Elective60799 (80.890%)7197 (66.479%) 5809 (65.59%)6160 (69.55%) 
Emergency14364 (19.110%)3629 (33.521%) 3048 (34.41%)2697 (30.45%) 
Surgical risk  26.7%  7.0%
Low39779 (52.924%)4531 (41.853%) 3599 (40.63%)3880 (43.81%) 
Moderate32691 (43.493%)5417 (50.037%) 4612 (52.07%)4314 (48.71%) 
High2693 (3.583%)878 (8.110%) 646 (7.29%)663 (7.49%) 
RCRI CATEGORY  52.7%  18.0%
I41157 (54.757%)3769 (34.814%) 3484 (39.34%)3138 (35.43%) 
II9884 (13.150%)2516 (23.240%) 1766 (19.94%)2066 (23.33%) 
III1559 (2.074%)869 (8.027%) 476 (5.37%)728 (8.22%) 
IV473 (0.629%)407 (3.759%) 224 (2.53%)336 (3.79%) 
NA22090 (29.389%)3265 (30.159%) 2907 (32.82%)2589 (29.23%) 
ASA CATEGORY  72.3%  35.0%
118716 (24.901%)1109 (10.244%) 1117 (12.61%)816 (9.21%) 
243132 (57.385%)4592 (42.416%) 4447 (50.21%)3839 (43.34%) 
39813 (13.056%)4453 (41.132%) 2379 (26.86%)3738 (42.20%) 
NA3502 (4.659%)672 (6.207%) 914 (10.32%)464 (5.24%) 
Postop- transfusion40.7%  28.0%
0 units75081 (99.891%)9966 (92.056%) 8787 (99.21%)8352 (94.30%) 
≥1 unit82 (0.109%)860 (7.944%) 70 (0.79%)505 (5.70%) 
ICUADMGT24H  19.1%  00.0%
No74366 (98.940%)10386 (95.936%) 8542 (96.44%)8542 (96.44%) 
Yes797 (1.060%)440 (4.064%) 315 (3.56%)315 (3.56%) 
THIRTY-DAY MORTALITY N(%)21.4%  09.0%
No74955 (99.723%)10505 (97.035%) 8749 (98.78%)8638 (97.53%) 
Yes208 (0.277%)321 (2.965%) 108 (1.22%)219 (2.47%) 
  1. Noted: SD was calculated by Kruskal-Wallis H test
  2. Abbreviations: GA general anesthesia, RA regional anesthesia, PREOP-eGFR preoperative estimated glomerular filtration rate (mL/min/1.73m2), RDW red cell distribution, NA not available, CVA cerebrovascular accidents, IHD ischemic heart disease, CHF congestive heart failure, DM diabetes mellitus requiring insulin therapy; creatinine>2.0mg/dl, Preop preoperative, Intraop intraoperative, Postop postoperative, RCRI Revised Cardiac Risk Index, ASA American Society of Anesthesiologists, ICU Intensive Care Unit, ICUADMGT24H admission to ICU for >24 hours