Table 1.
Baseline Patient Characteristics
| Characteristics | Total (n=887) | Adherence Group (n=786) | Non-Adherence Group (n=101) | p-value |
|---|---|---|---|---|
| Age | ||||
| Median (IQR), years | 73 (67–78) | 73 (67–78) | 73 (70–79) | 0.200 |
| Age group, n (%) | ||||
| ≤64 years | 176 (19.8) | 165 (21) | 11 (10.9) | 0.046* |
| 65–74 years | 326 (36.8) | 282 (35.9) | 44 (43.6) | |
| ≥75 years | 385 (43.4) | 339 (43.1) | 46 (45.5) | |
| Sex, n (%) | ||||
| Male | 648 (73.1) | 566 (72.0) | 82 (81.2) | 0.066 |
| Female | 239 (26.9) | 220 (28.0) | 19 (18.8) | |
| Race, n (%) | ||||
| Asian | 885 (99.9) | 784 (99.8) | 101 (100.0) | 1.000 |
| White | 1 (0.1) | 1 (0.1) | 0 (0.0) | |
| Missing data | 1 (0.1) | 1 (0.1) | 0 (0.0) | |
| Presence of dementia, n (%) | 16 (1.9) | 12 (1.6) | 4 (4.1) | 0.181 |
| Missing data | 25 (2.8) | 22 (2.8) | 3 (3.0) | |
| Presence of roommate, n (%) | 687 (77.5) | 612 (80.0) | 75 (76.5) | 0.503 |
| Missing data | 24 (2.7) | 21 (2.7) | 3 (3.0) | |
| Number of medications | ||||
| Median (IQR) | 7 (5–10) | 7 (5–10) | 6 (4–9) | 0.030* |
| Medications that affect surgery, n (%) | ||||
| One | 693 (78.1) | 617 (78.5) | 76 (75.2) | 0.735 |
| Two | 166 (18.7) | 145 (18.4) | 21 (20.8) | |
| Three or more | 28 (3.2) | 24 (3.1) | 4 (4.0) | |
| Type of medication, n (%) | ||||
| Antiplatelet medication | 820 (74.9) | 719 (74.3) | 101 (79.5) | 0.015* |
| Anticoagulant medication | 81 (7.4) | 80 (8.3) | 1 (0.8) | |
| Activated coagulation factor X inhibitor | 131 (12.0) | 114 (11.8) | 17 (13.3) | |
| Thrombin inhibitor | 23 (2.1) | 21 (2.2) | 2 (1.6) | |
| Improve cerebral blood circulation | 12 (1.1) | 10 (1.0) | 2 (1.6) | |
| Improve coronary blood flow | 28 (2.6) | 24 (2.4) | 4 (3.2) | |
| Number of days until surgery | ||||
| Median (IQR), days | 17 (11–26) | 16 (11–26) | 20 (14–27) | 0.084 |
| n (%) | ||||
| <30 | 761 (85.8) | 674 (85.8) | 87 (86.1) | 1.000 |
| ≥30 | 126 (14.2) | 112 (14.2) | 14 (13.9) | |
| Department, n (%) | ||||
| Urology | 439 (49.5) | 382 (48.6) | 57 (56.4) | 0.318 |
| Gastrointestinal surgery | 159 (17.9) | 144 (18.3) | 15 (14.9) | |
| Otolaryngology | 129 (14.5) | 113 (14.4) | 16 (15.8) | |
| Plastic surgery | 95 (10.7) | 89 (11.3) | 6 (5.9) | |
| Gynecology | 34 (3.8) | 32 (4.1) | 2 (2.0) | |
| Breast surgery | 22 (2.5) | 19 (2.4) | 3 (3.0) | |
| Respiratory surgery | 9 (1.0) | 7 (0.9) | 2 (2.0) |
Notes: *Significant (p<0.05). p-values for continuous variables (age, number of medications, number of days until surgery) were calculated using the Mann–Whitney U-test. Those for categorical variables (age group, number of days until surgery, sex, presence of roommate, and type of medication) were calculated using chi-squared test. For other categorical variables (race, medications that affect surgery, type of medication, department), p-values were calculated using Fisher’s exact test.
Abbreviation: IQR, interquartile range.