Table 2. Variables used in the propensity model for women and men with standardized differences after matching.
| Baseline characteristic | Women with ICDN=430 | Women after 1:1 matching | Men with ICDN=859 | Men after 1:1 matching | ||
|---|---|---|---|---|---|---|
| No ICDN=430 | % standardized difference* | No ICDN= 859 | % standardized difference* | |||
| Age, years | 76 (71, 81) | 76 (71, 80) | 0 | 75 (70, 80) | 75 (71, 80) | 4 |
| White race | 76% (325) | 75% (324) | 1 | 84% (720) | 85% (731) | 4 |
| LVEF (%), mean (SD) | 24.4 (6.93) | 24.9 (6.7) | 7 | 24.8 (6.9) | 24.9 (6.4) | 1 |
| Systolic BP | 133 (116, 150) | 135 (120, 151) | 3 | 130 (112, 148) | 130 (114, 146) | 2 |
| Ischemic heart disease | 58% (251) | 59% (254) | 1 | 74% (633) | 77% (661) | 8 |
| Prior atrial arrhythmia | 28% (119) | 26% (112) | 4 | 32% (274) | 32% (273) | 0 |
| Diabetes | 41% (177) | 44% (189) | 6 | 36% (310) | 37% (315) | 1 |
| Hypertension | 76% (328) | 78% (335) | 4 | 67% (577) | 70% (598) | 5 |
| Chronic renal insufficiency | 16% (67) | 17% (73) | 4 | 16% (138) | 16% (138) | 0 |
| Depression | 6% (24) | 5% (20) | 4 | 5% (47) | 5% (46) | 1 |
| COPD/asthma | 27% (114) | 28% (121) | 4 | 23% (201) | 21% (184) | 5 |
| Anemia | 12% (53) | 13% (56) | 2 | 8% (70) | 8% (71) | 0 |
| Prior CVA or TIA | 13% (56) | 12% (50) | 4 | 12% (102) | 11% (95) | 3 |
| ACE-inhibitor or ARB | 77% (331) | 76% (325) | 3 | 77% (661) | 78% (672) | 3 |
| Beta blocker | 90% (387) | 92% (396) | 7 | 90% (769) | 90% (772) | 1 |
| Calcium channel blocker | 13% (55) | 16% (67) | 3 | 13% (114) | 13% (109) | 2 |
| Digoxin | 37% (158) | 37% (158) | 3 | 35% (297) | 31% (270) | 7 |
| Diuretic | 79% (339) | 81% (349) | 2 | 78% (666) | 82% (701) | 10 |
| Statin | 47% (201) | 47% (203) | 0 | 47% (400) | 47% (408) | 2 |
| Sodium | 138 (136, 140) | 138 (136, 140) | 1 | 138 (136, 141) | 138 (136, 141) | 2 |
| BUN | 24 (17, 35) | 25 (18, 35) | 2 | 26 (19, 37) | 27 (20, 38) | 5 |
| Creatinine | 1.2 (0.9, 1.7) | 1.2 (0.9, 1.7) | 1 | 1.4 (1.1, 1.9) | 1.4 (1.1, 1.9) | 2 |
| Hemoglobin | 12.3 (11.0, 13.4) | 12.0 (10.9, 13.3) | 5 | 13.0 (11.8, 14.3) | 12.8 (11.7, 14.0) | 10 |
| Site: Northeast | 41% (175) | 39% (169) | 3 | 138 (136, 141) | 138 (136, 141) | 2 |
| Site: Teaching hospital | 75% (321) | 72% (311) | 5 | 26 (19, 37) | 27 (20, 38) | 5 |
| Site: Number of beds | 438 (339, 593) | 435 (311, 559) | 8 | 1.4 (1.1, 1.9) | 1.4 (1.1, 1.9) | 2 |
| Site: Advanced cardiac procedures performed† | 92% (397) | 93% (398) | 1 | 13.0 (11.8, 14.3) | 12.8 (11.7, 14.0) | 10 |
Dataset used in matching is shown here, i.e., with a single imputation for missing data, which affects race, systolic BP, medications, labs, and site performance of cardiac procedures (no other variables had missing data); therefore slight differences may be noted in these variables between this table and Table 1. For medications, patients with noted contraindications are counted as “no” in Table 2 but as missing in Table 1.
*
The standardized difference is the absolute difference in means (or proportions) divided by the average standard deviation.
†
Hospital performs PCI, cardiac surgery, or heart transplants. Continuous variables are shown as median (25th, 75th percentiles), except where noted, and categorical variables as percent (number).