Table 1 Pearson’s correction coefficient (r) and melatonin levels of passive (P) and non-cotton (PP–PE polymer) swab saliva (N) collection methods for all, lower melatonin level (< 6 pg/ml), and higher melatonin level (> 6 pg/ml) samples
From: Non-cotton swab sample collection may not affect salivary melatonin assay results
Mean and standard deviation (SD) | r | ||
|---|---|---|---|
P (pg/ml) | N (pg/ml) | P vs. N | |
< 6 pg/ml | 2.11 (1.38) | 2.21 (1.33) | 0.93* |
> 6 pg/ml | 16.59 (8.18) | 16.48 (8.75) | 0.97* |
All | 8.26 (9.01) | 8.28 (9.14) | 0.99* |