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| GG (N = 15) | GT + TT (N = 25) | z/χ2 | P | |
|---|---|---|---|---|
| ET-1 (pg/ml) | 1.223 ± 0.856 | 3.333 ± 2.517 | 3.102 | 0.002 |
| Maximal oxygenation index | 6.275 ± 3.587 | 20.925 ± 23.139 | 2.900 | 0.004 |
| Ventilation time (d) | 3.6 ± 3.3 | 5.8 ± 2.6 | 3.749 | 0 |
| Mortality (%) | 0 | 3(12) | 1.946 | 0.279 |
Note: As we believe that T allele carriers were more susceptible to PPHN, infants with the GT and TT genotypes were combined into one group.
