Table 4.
Distribution of Direct Medical Care Costsa for the Random Sample of Olmsted County Residents Who Met Rochester Epidemiology Project (REP) Criteria for Traumatic Brain Injury (TBI) (i.e., Cases) and Their Matchedb Non-TBI Controls, for Specified Time Periods after Baselinec
|
4A. Definite TBI cases and matched controls | |||||||
|---|---|---|---|---|---|---|---|
| Time period, no. of pairs (% entering) | Mean | No. with zero costs | 25thpercentile | 50thpercentile | 75thpercentile | Maximum | |
| Full period: Baseline to 6 years, 93 (100%) | Case | 35,244 | 11/93 (12%) | 4169 | 15,781 | 48,146 | 226,699 |
| Control | 14,639 | 3/93 (3%) | 391 | 2755 | 14,102 | 415,802 | |
| 1 day to 6 months, 75 (81%) | Case | 24,838 | 2/75 (3%) | 2153 | 10,741 | 33,146 | 168,340 |
| Control | 1999 | 12/75 (16%) | 87 | 321 | 1631 | 29,340 | |
| 6–12 months, 57 (61%) | Case | 2349 | 9/57 (16%) | 50 | 259 | 935 | 53,053 |
| Control | 966 | 18/57 (32%) | 0 | 215 | 431 | 18,329 | |
| 1–6 years, 53 (57%) | Case | 16,875 | 2/53 (4%) | 855 | 4101 | 16,545 | 155,321 |
| Control | 20,394 | 1/53 (2%) | 1122 | 4772 | 19,027 | 402,190 | |
|
4B. Probable TBI cases and matched controls | |||||||
|---|---|---|---|---|---|---|---|
| Time period, no. of pairs (% entering) | Mean | Percent with zero costs | 25thpercentile | 50thpercentile | 75thpercentile | Maximum | |
| Full period: Baseline to 6 years, 435 (100%) | Case | 16,722 | 0/435 (0%) | 2526 | 6345 | 16,033 | 319,902 |
| Control | 13,221 | 1/435 (0.2%) | 1151 | 3255 | 9712 | 422,483 | |
| 1 day to 6 months, 434 (99.8%) | Case | 3720 | 39/434 (9%) | 195 | 711 | 2781 | 94,100 |
| Control | 2737 | 83/434 (19%) | 43 | 273 | 787 | 301,708 | |
| 6–12 months, 402 (92%) | Case | 1616 | 130/402 (32%) | 0 | 137 | 635 | 72,109 |
| Control | 1196 | 103/402 (26%) | 0 | 144 | 496 | 29,519 | |
| 1–6 years, 373 (86%) | Case | 11,521 | 18/373 (5%) | 643 | 2742 | 8330 | 307,165 |
| Control | 10,505 | 14/373 (4%) | 781 | 2348 | 7339 | 327,086 | |
|
4C. Possible TBI cases and matched controls | |||||||
|---|---|---|---|---|---|---|---|
| Time period, no. of pairs (% entering) | Mean | % with zero costs | 25thpercentile | 50thpercentile | 75thpercentile | Maximum | |
| Full period: Baseline to 6 years, 617 (100%) | Case | 13,319 | 0/617 (0%) | 1750 | 4718 | 13,493 | 335,013 |
| Control | 9789 | 6/617 (1%) | 1042 | 3184 | 9656 | 169,275 | |
| 1 day to 6 months, 616 (99.8%) | Case | 1686 | 70/616 (11%) | 122 | 477 | 1229 | 64,099 |
| Control | 1875 | 125/616 (20%) | 43 | 221 | 726 | 87,873 | |
| 6–12 months, 576 (93%) | Case | 1,154 | 140/576 (24%) | 13 | 205 | 760 | 40,237 |
| Control | 1,198 | 170/576 (30%) | 0 | 119 | 538 | 141,004 | |
| 1–6 years, 537 (85%) | Case | 11,725 | 22/537 (4%) | 1131 | 3785 | 11,464 | 232,117 |
| Control | 7309 | 19/537 (4%) | 814 | 2392 | 6862 | 130,198 | |
Dollar values were adjusted for inflation and geographical wage differences to express costs for each year in 2007 nationally representative constant dollars.
Controls were matched to cases for age, sex, calendar year, severity of non-head injuries at baseline, and length of follow-up; follow-up for each member of the case/control pair was censored as of the earliest death or emigration of either member.
Date of incident TBI for cases, closest REP registration date for regular controls, and relevant hospital or emergency department visit for special controls.