Table 2.
The donor features used in the IHTSA model.
| Feature | N | Time era 1997–2008 | Time era 2009–2011 | p-Value | IMPACT | IHTSA |
|---|---|---|---|---|---|---|
| (n = 22,263) | (n = 5,597) | |||||
| Demographic data | ||||||
| Age (years) | 27,075 | 32 ± 12 | 32 ± 12 | 0.515 | ✓ | |
| Female gender | 27,860 | 6,546 (29%) | 1,645 (29%) | 0.979 | ✓ | |
| Weight (kg) | 27,838 | 79 ± 19 | 82 ± 19 | 0.001 | ✓ | |
| Duration of ischemia (min) | 26,029 | 189 ± 63 | 194 ± 10 | 0.001 | ✓ | |
| CODD: Head Trauma | 27,825 | 13,733 (62%) | 3,068 (55%) | 0.001 | ✓ | |
| CODD: Cerebrovascular event | 27,825 | 5,894 (27%) | 1,297 (23%) | 0.001 | ✓ | |
| Donor blood group | ||||||
| A | 27,859 | 8,232 (37%) | 1,983(35%) | 0.030 | ✓ | |
| B | 27,859 | 2,284 (10%) | 617 (11%) | 0.102 | ✓ | |
| AB | 27,859 | 477 (2%) | 125 (2%) | 0.682 | ✓ | |
| O | 27,859 | 11269 (40%) | 2,873 (51%) | 0.001 | ✓ | |
| Recipient-donor weight ratio | 27,739 | 1.03 ± 0.22 | 1.02 ± 0.20 | 0.001 | ✓ | |
| Recipient-donor height ratio | 27,660 | 0.998 ± 0.06 | 0.999 ± 0.06 | 0.068 | ✓ | |
N, number of transplants with non-missing values. n, total number of transplants. Qualitative data are expressed as n (%), and quantitative data as mean ± SD. CODD, cause of donor death; IHTSA, international heart transplantation survival algorithm; IMPACT, index for mortality prediction after cardiac transplantation. The t-test and chi-squared test was used for continuous respectively categorical values.