Distributions of NEP polymorphism in patients with Alzheimer's disease (AD) and non-demented patients
| NEP genotype | 19/19 | 19/20 | 19/21 | 20/20 | 20/21 | 20/22 | 20/23 | 21/21 | 21/23 | p value |
| AD (n=75) | 1 | 4 | 3 | 51 | 9 | 0 | 1 | 4 | 2 | 0.39 |
| Non-demented (n=89) | 3 | 6 | 1 | 51 | 14 | 5 | 1 | 7 | 1 | |
| NEP allele | 19 | 20 | 21 | 22 | 23 | p value | ||||
| AD (n=75) | 9 | 116 | 22 | 0 | 3 | 0.25 | ||||
| Non-demented (n=89) | 13 | 128 | 30 | 5 | 2 | |||||
NEP=neprilysin gene.