Table 4.
Analysis of fastpatch wear times
| (a) Proportion of patches positive | ||||||
|---|---|---|---|---|---|---|
| N=174 | 15 minutes | 20 minutes | 30 minutes | Overall | ||
| GCMS | ||||||
| Cocaine | 31.0% | 31.0% | 29.9% | 91.9% | ||
| BE | 20.1% | 21.3% | 17.2% | 58.6% | ||
| AEME | 17.2% | 19.5% | 15.5% | 52.2% | ||
| ECD | 3.4% | 2.9% | 1.1% | 7.4% | ||
| (b) Average concentrations of analytes detected by GC/MS | ||||||
|
15 minutes |
20 minutes |
30 minutes |
||||
| Mean | SD | Mean | SD | Mean | SD | |
| Cocaine | 1290 | 305 | 2555 | 8342 | 1007 | 2233 |
| BE | 174 | 814 | 222 | 722 | 71 | 157 |
| AEME | 90 | 286 | 160 | 513 | 69 | 158 |
| ECD | 6 | 36 | 5 | 20 | 2 | 7 |
(a) No differences in rates between conditions are significant. Overall rates differ slightly from earlier table due to smaller sample.
(b) Units shown are nanograms per millileter of patch eluate. For analysis purposes analyte levels were transformed using a log transformation, ln (1 + x). Analysis of variance was performed on these transformed values. There were no significant differences of analyte concentrations between different wear times.