Table 2.
Standardized Differences for the Matched Samples and Unmatched Cohortsa
| Variables | 2007–2008 Matched Sample |
2009–2010 Matched Sample |
||||||
|---|---|---|---|---|---|---|---|---|
| Statin Treatment N = 670 | No Statin Treatment N = 670 | Standardized Difference (Matched) | Standardized Difference (Unmatched) | Statin Treatment N = 439 | No Statin Treatment N = 439 | Standardized Difference (Matched) | Standardized Difference (Unmatched) | |
| Age categories | ||||||||
| 18–34 | 5 (0.75) | 6 (0.90) | 0.02 | 0.54 | 11 (2.51) | 9 (2.05) | 0.03 | 0.94 |
| 35–44 | 19 (2.84) | 13 (1.94) | 0.06 | 0.30 | 45 (10.25) | 40 (9.11) | 0.04 | 0.28 |
| 45–54 | 54 (8.06) | 52 (7.76) | 0.01 | 0.23 | 138 (31.44) | 138 (31.44) | 0.00 | 0.09 |
| 55–64 | 91(13.58) | 95 (14.18) | 0.02 | 0.08 | 123 (28.02) | 129 (29.38) | 0.03 | 0.43 |
| ≥65 | 501 (74.78) | 504 (75.22) | 0.01 | 0.55 | 122 (27.79) | 123 (28.02) | 0.01 | 0.57 |
| Sex | ||||||||
| Female | 350 (52.24) | 379 (56.57) | — | — | 245 (55.81) | 252 (57.40) | — | — |
| Male | 320 (47.76) | 291 (43.43) | 0.09 | 0.16 | 194 (44.19) | 187 (42.60) | 0.03 | 0.07 |
| Race | ||||||||
| White | 534 (79.70) | 533 (79.55) | 0.00 | 0.55 | 319 (72.67) | 315 (71.75) | 0.01 | 0.57 |
| Black | 107 (15.97) | 108 (16.12) | 0.00 | 0.21 | 96 (21.87) | 101 (23.01) | 0.03 | 0.15 |
| Other | 30 (4.48) | 30 (4.48) | 0.00 | 0.02 | 24 (5.47) | 23 (5.24) | 0.01 | 0.06 |
| Hispanic | 9 (1.34) | 7 (1.04) | 0.03 | 0.20 | 21 (4.78) | 25 (5.69) | 0.04 | |
| Admitted from LTCF | 92 (13.73) | 104 (15.52) | 0.05 | 0.20 | 27 (6.15) | 32 (7.29) | 0.05 | 0.16 |
| Underlying conditions | ||||||||
| Cardiovascular Disease | 422 (62.99) | 433 (64.63) | 0.03 | 0.70 | 173 (39.41) | 163 (37.13) | 0.05 | 0.81 |
| Chronic Metabolic Disease | 332 (49.55) | 317 (47.31) | 0.05 | 0.52 | 223 (50.80) | 218 (49.66) | 0.02 | 0.93 |
| Chronic Lung Disease | 209 (31.19) | 208 (31.04) | 0.00 | 0.20 | 134 (30.52) | 140 (31.89) | 0.03 | 0.35 |
| Renal Disease | 130 (19.40) | 137 (20.45) | 0.03 | 0.28 | 64 (14.58) | 64 (14.58) | 0.00 | 0.43 |
| Asthma | 76 (11.34) | 68 (10.15) | 0.04 | 0.15 | 120 (27.33) | 113 (25.74) | 0.04 | 0.15 |
| Other Chronic Conditionsb | 198 (29.55) | 208 (31.04) | 0.03 | 0.09 | 114 (25.97) | 116 (26.42) | 0.01 | 0.02 |
| Body Mass Index | ||||||||
| Underweight | — | — | — | — | 6 (1.37) | 4 (0.91) | 0.04 | 0.16 |
| Normal | — | — | — | — | 88 (20.05) | 89 (20.27) | 0.01 | 0.23 |
| Overweight | — | — | — | — | 102 (23.23) | 100 (22.78) | 0.01 | 0.00 |
| Obese | — | — | — | — | 163 (37.13) | 167 (38.04) | 0.02 | 0.10 |
| Morbidly obese | — | — | — | — | 80 (18.22) | 79 (18.00) | 0.01 | 0.20 |
| Vaccinated (Yes) | 441 (65.82) | 446 (66.57) | 0.02 | 0.35 | 142 (32.35) | 152 (34.62) | 0.05 | 0.18 |
| Antiviral (Yes)c | 372 (55.52) | 364 (54.33) | 0.02 | 0.06 | 374 (85.19) | 369 (84.05) | 0.03 | 0.02 |
Abbreviations: LTCF, long-term care facility.
a Data shown as frequency and (%), except for standardized difference.
b Other chronic diseases is a combination of any underlying chronic illnesses mentioned in patient medical records other than cardiovascular disease, chronic metabolic disease, chronic lung disease, renal disease, asthma, and obesity.
c Any antivirals administered during the course of illness.