Table 1 Pearson's correlation coefficient (r) and concentrations of passive saliva (P) and cotton saliva (C) melatonin for all, lower-level (<6 pg/mL), and higher-level (>6 pg/mL) samples.
From: Effects of saliva collection using cotton swabs on melatonin enzyme immunoassay
| Â | Mean and standard deviation (SD) | r | |
|---|---|---|---|
| Â | P (pg/mL) | C (pg/mL) | P vs. C |
<6 pg/mL | 3.14 (1.10) | 3.04 (1.04) | 0.01 |
>6 pg/mL | 24.22 (14.82) | 4.91 (1.55)** | 0.44* |
All | 15.43 (15.40) | 4.13 (1.63)** | 0.62** |