Table 2 Findings of Wilcoxon signed-rank test for scores of fingermarks retrieved from depletion and ageing studies upon each tested surface
From: Nanocarbon powder for latent fingermark development: a green chemistry approach
Material | Negative rank | Positive rank | Ties | Sig./p value | Z | N | Median CNP18 | Median BP |
|---|---|---|---|---|---|---|---|---|
Multiple donors studies | ||||||||
Porcelain crucible | 6 | 11 | 19 | 0.435 | − 0.776b | 36 | 2.5 | 2.0 |
Depletion studies | ||||||||
Porcelain crucible | 9 | 8 | 13 | 0.403 | − 0.836b | 30 | 2.0 | 2.5 |
Electrical switch | 4 | 20 | 6 | 0.001 | − 3.229c | 30 | 4.0 | 1.5 |
Tempered glass | 18 | 3 | 9 | 0.001 | − 3.422b | 30 | 2.0 | 3.0 |
Stainless steel tool | 9 | 14 | 7 | 0.076 | − 1.775c | 30 | 2.0 | 2.0 |
Glossed wood | 20 | 2 | 8 | 0.000 | − 3.788b | 30 | 0.0 | 1.5 |
CD-ROM | 7 | 6 | 17 | 0.829 | − 0.216c | 30 | 3.0 | 3.0 |
Brown tape | 17 | 3 | 10 | 0.002 | − 3.144b | 30 | 3.0 | 4.0 |
Credit card | 14 | 5 | 11 | 0.340 | − 0.955b | 30 | 3.0 | 3.0 |
Currency note | 24 | 1 | 5 | 0.000 | − 4.274b | 30 | 0.0 | 2.0 |
Translucent plastic | 20 | 1 | 9 | 0.000 | − 3.886b | 30 | 2.5 | 4.0 |
Ageing studies | ||||||||
Porcelain crucible | 8 | 4 | 9 | 0.266 | − 1.112b | 21 | 4.0 | 5.0 |
Electrical switch | 15 | 2 | 4 | 0.003 | − 2.960b | 21 | 1.0 | 3.0 |
Tempered glass | 6 | 1 | 14 | 0.031 | − 2.156b | 21 | 5.0 | 5.0 |
Stainless steel tool | 1 | 6 | 14 | 0.058 | − 1.897c | 21 | 4.0 | 4.0 |
Glossed wood | 12 | 3 | 6 | 0.002 | − 3.041b | 21 | 2.0 | 3.0 |
CD-ROM | 5 | 8 | 8 | 0.740 | − 0.332c | 21 | 4.0 | 4.0 |
Brown tape | 3 | 1 | 17 | 0.317 | − 1.000b | 21 | 1.0 | 1.0 |
Credit card | 11 | 2 | 8 | 0.015 | − 2.433b | 21 | 3.0 | 4.0 |
Currency note | 11 | 2 | 8 | 0.020 | − 2.331b | 21 | 2.0 | 4.0 |
Translucent plastic | 6 | 5 | 10 | 0.891 | − 0.137b | 21 | 3.0 | 2.0 |