Table 2.
Imbalance of patient characteristics before and after propensity score matching in the assessment of delirium
| Item n |
Unmatched | SMD | Matched | SMD | ||||
|---|---|---|---|---|---|---|---|---|
| Non-statins | Statins | SMD | − 0.1 | Non-statins | Statins | SMD | − 0.1 | |
| 1241 | 1484 | 955 | 955 | |||||
| Age (year) | 69.46 (11.77) | 73.12 (9.80) | 0.338 | > 0.1 | 71.56 (11.38) | 71.54 (9.58) | 0.002 | < 0.1 |
| SBP (mmHg) | 116.61 (15.63) | 117.41 (16.35) | 0.05 | < 0.1 | 117.03 (15.40) | 117.40 (16.22) | 0.023 | < 0.1 |
| DBP (mmHg) | 63.14 (10.99) | 60.91 (10.59) | 0.207 | > 0.1 | 62.22 (10.69) | 62.15 (10.78) | 0.006 | < 0.1 |
| HR (beats/min) | 87.74 (16.36) | 84.37 (14.75) | 0.216 | > 0.1 | 86.22 (15.95) | 85.90 (15.38) | 0.021 | < 0.1 |
| SpO2 (%) | 96.16 (2.34) | 96.18 (2.20) | 0.008 | < 0.1 | 96.15 (2.35) | 96.18 (2.15) | 0.009 | < 0.1 |
| Asthma | 55 (4.4) | 59 (4.0) | 0.023 | < 0.1 | 45 ( 4.7) | 47 (4.9) | 0.01 | < 0.1 |
| CAD | 117 (9.4) | 339 (22.8) | 0.371 | > 0.1 | 111 (11.6) | 119 (12.5) | 0.026 | < 0.1 |
| Liver disease | 219 (17.6) | 95 ( 6.4) | 0.351 | > 0.1 | 85 (8.9) | 87 (9.1) | 0.007 | < 0.1 |
| Malignant cancer | 255 (20.5) | 191 (12.9) | 0.207 | > 0.1 | 165 (17.3) | 155 (16.2) | 0.028 | < 0.1 |
| PLT (109/L) | 225.28 (114.45) | 227.34 (99.49) | 0.019 | < 0.1 | 229.06 (108.70) | 230.91 (105.12) | 0.017 | < 0.1 |
| HGB (g/L) | 11.46 (2.26) | 11.26 (2.10) | 0.094 | < 0.1 | 11.38 (2.22) | 11.42 (2.13) | 0.018 | < 0.1 |
| Calcium (mg/dL) | 8.58 (0.81) | 8.64 (0.69) | 0.076 | < 0.1 | 8.62 (0.80) | 8.61 (0.69) | 0.012 | < 0.1 |
| Sodium (mmol/L) | 139.55 (5.27) | 139.73 (4.64) | 0.036 | < 0.1 | 139.70 (4.87) | 139.72 (4.60) | 0.005 | < 0.1 |
| Glucose (mg/dL) | 169.56 (96.72) | 177.37 (104.89) | 0.077 | < 0.1 | 170.52 (100.27) | 172.39 (92.73) | 0.019 | < 0.1 |
| Glucocorticoid | 483 (38.9) | 485 (32.7) | 0.13 | > 0.1 | 355 (37.2) | 355 (37.2) | < 0.001 | < 0.1 |
| Antibiotic | 1073 (86.5) | 1207 (81.3) | 0.14 | > 0.1 | 802 (84.0) | 804 (84.2) | 0.006 | < 0.1 |
| Norepinephrine | 238 (19.2) | 337 (22.7) | 0.087 | < 0.1 | 202 (21.2) | 188 (19.7) | 0.036 | < 0.1 |
| Epinephrine | 56 (4.5) | 74 (5.0) | 0.022 | < 0.1 | 47 (4.9) | 40 (4.2) | 0.035 | < 0.1 |
| Vasopressin | 114 (9.2) | 170 (11.5) | 0.075 | < 0.1 | 102 (10.7) | 88 (9.2) | 0.049 | < 0.1 |
| ACEI/ARB | 122 (9.8) | 294 (19.8) | 0.284 | > 0.1 | 117 (12.3) | 124 (13.0) | 0.022 | < 0.1 |
| SAPII | 40.39 (14.03) | 39.28 (11.58) | 0.087 | < 0.1 | 39.81 (13.40) | 39.74 (12.17) | 0.006 | < 0.1 |
| OASIS | 35.51 (9.39) | 33.29 (8.46) | 0.249 | > 0.1 | 34.47 (9.08) | 34.47 (8.60) | < 0.001 | < 0.1 |
| Los-ICU | 6.01 (6.45) | 5.10 (5.45) | 0.152 | > 0.1 | 5.51 (5.99) | 5.55 (6.16) | 0.006 | < 0.1 |
An absolute MSD < 10% was considered to support the assumption of a balance between the groups. SMD: standardized mean differences. Data are presented as medians [interquartile ranges], mean [SD] or as numbers (percentages)
SBP systolic blood pressure, DBP diastolic blood pressure, HR heart rate, CAD coronary artery disease, CVD cerebrovascular disease, RR respiratory rate, HGB hemoglobin, WB white blood cell count, ACEI/ARB angiotensin-converting enzyme inhibitors/angiotensin II inhibitors, SAPS II Simplified Acute Physiology Score, OASIS Oxford Acute Severity of Illness Score, Los length of stay