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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*
  1. *p < 0.05