Table 2.
Spearman correlation coefficients (ρ) for meconium marker correlations to each other and summation calculationsa
| EtG | EtS | Summed EtG EtS |
Ethyl Laurate |
Ethyl Myristate |
Ethyl Linolenate |
Ethyl Palmitoleate |
Ethyl Arachidonate |
Ethyl Linoleate |
Ethyl Palmitate |
Ethyl Oleate |
Ethyl Stearate |
Summed 9 FAEE |
Summed 7 FAEE |
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| EtS | 0.2852 (P=0.0029) | |||||||||||||
| Summed EtG EtS | 0.9786 (P<0.0001) | 0.3830 (P<0.0001) | ||||||||||||
| Ethyl Laurate | 0.0999 (P=0.3061) | 0.3586 (P=0.0001) | 0.1468 (P=0.1314) | |||||||||||
| Ethyl Myristate | 0.2448 (P=0.0110) | 0.2559 (P=0.0078) | 0.2728 (P=0.0045) | 0.6442 (P<0.0001) | ||||||||||
| Ethyl Linolenate | 0.1634 (P=0.0927) | 0.3632 (P=0.0001) | 0.2124 (P=0.0281) | 0.8971 (P<0.0001) | 0.7323 (P<0.0001) | |||||||||
| Ethyl Palmitoleate | 0.2196 (P=0.0230) | 0.2365 (P=0.0142) | 0.2091 (P=0.0307) | 0.5033 (P<0.0001) | 0.7530 (P<0.0001) | 0.5080 (P<0.0001) | ||||||||
| Ethyl Arachidonate | 0.3259 (P=0.0006) | 0.3751 (P=0.0007) | 0.3441 (P=0.0003) | 0.4360 (P<0.0001) | 0.5926 (P<0.0001) | 0.5201 (P<0.0001) | 0.5799 (P<0.0001) | |||||||
| Ethyl Linoleate | 0.3237 (P=0.0007) | 0.2539 (P=0.0083) | 0.3400 (P=0.0003) | 0.5467 (P<0.0001) | 0.7292 (P<0.0001) | 0.5622 (P<0.0001) | 0.7082 (P<0.0001) | 0.7860 (P<0.0001) | ||||||
| Ethyl Palmitate | 0.3619 (P=0.0001) | 0.3185 (P=0.0008) | 0.3760 (P=0.0001) | 0.4206 (P<0.0001) | 0.7034 (P<0.0001) | 0.4469 (P<0.0001) | 0.7362 (P<0.0001) | 0.7580 (P<0.0001) | 0.7979 (P<0.0001) | |||||
| Ethyl Oleate | 0.3738 (P<0.0001) | 0.2665 (P=0.0055) | 0.3827 (P<0.0001) | 0.4953 (P<0.0001) | 0.6722 (P<0.0001) | 0.5046 (P<0.0001) | 0.6727 (P<0.0001) | 0.7732 (P<0.0001) | 0.9279 (P<0.0001) | 0.8018 (P<0.0001) | ||||
| Ethyl Stearate | 0.4882 (P<0.0001) | 0.2846 (P=0.0030) | 0.4783 (P<0.0001) | 0.3049 (P=0.0014) | 0.6057 (P<0.0001) | 0.3881 (P<0.0001) | 0.6381 (P<0.0001) | 0.7093 (P<0.0001) | 0.6432 (P<0.0001) | 0.7809 (P<0.0001) | 0.6768 (P<0.0001) | |||
| Summed 9 FAEE | 0.4217 (P<0.0001) | 0.2766 (P=0.0039) | 0.4329 (P<0.0001) | 0.4908 (P<0.0001) | 0.6748 (P<0.0001) | 0.5024 (P<0.0001) | 0.6630 (P<0.0001) | 0.7771 (P<0.0001) | 0.9117 (P<0.0001) | 0.8158 (P<0.0001) | 0.9828 (P<0.0001) | 0.7390 (P<0.0001) | ||
| Summed 7 FAEE | 0.4213 (P<0.0001) | 0.2766 (P=0.0039) | 0.4325 (P<0.0001) | 0.4888 (P<0.0001) | 0.6725 (P<0.0001) | 0.5004 (P<0.0001) | 0.6629 (P<0.0001) | 0.7790 (P<0.0001) | 0.9114 (P<0.0001) | 0.8169 (P<0.0001) | 0.9829 (P<0.0001) | 0.7398 (P<0.0001) | 0.9999 (P<0.0001) | |
| Summed 4 FAEE | 0.4299 (P<0.0001) | 0.2750 (P=0.0041) | 0.4382 (P<0.0001) | 0.4733 (P<0.0001) | 0.6702 (P<0.0001) | 0.4871 (P<0.0001) | 0.6684 (P<0.0001) | 0.7758 (P<0.0001) | 0.9050 (P<0.0001) | 0.8244 (P<0.0001) | 0.9801 (P<0.0001) | 0.7542 (P<0.0001) | 0.9989 (P<0.0001) | 0.9990 (P<0.0001) |
a
For marker combinations, individual analyte nmol/g concentrations were summed. Summed 7 FAEE, included all except ethyl laurate and myristate, as recommended in meconium (9, 10), and summed 4 FAEE included ethyl myristate, palmitate, oleate, and stearate, as recommended in hair (31).
b Strong (ρ=0.7-0.899) and exceptionally strong correlations (ρ=0.9-1.0) are shown in bold (32).