Table 2.
Sphingolipid concentrations, expressed in terms of normalized peak area ratios
| Species | Log of normalized peak ratio, mean ± SD | Normalized peak ratio, median of Q1 | Normalized peak ratio, median of Q5 | Fold difference in normalized peak ratio: Q5 median/Q1 median |
|---|---|---|---|---|
| Cer-16 |
−0.61 ± 0.30 |
0.37 |
0.79 |
2.14 |
| Cer-18 |
−0.81 ± 0.44 |
0.26 |
0.77 |
2.96 |
| Cer-20 |
−0.31 ± 0.40 |
0.46 |
1.18 |
2.57 |
| Cer-22 |
0.28 ± 0.36 |
0.85 |
2.10 |
2.46 |
| Cer-24 |
0.79 ± 0.32 |
1.49 |
3.31 |
2.22 |
| GluCer-16 |
−0.07 ± 0.28 |
0.66 |
1.31 |
1.98 |
| GluCer-22 |
0.34 ± 0.29 |
0.97 |
2.04 |
2.10 |
| GluCer-24 |
0.25 ± 0.31 |
0.86 |
1.88 |
2.19 |
| LacCer-16 |
−0.12 ± 0.25 |
0.65 |
1.21 |
1.86 |
| SM-14 |
−0.01 ± 0.39 |
0.60 |
1.59 |
2.65 |
| SM-16 |
0.12 ± 0.19 |
0.89 |
1.44 |
1.62 |
| SM-18 |
−0.18 ± 0.24 |
0.62 |
1.13 |
1.82 |
| SM-20 |
0.08 ± 0.26 |
0.78 |
1.51 |
1.94 |
| SM-22 |
0.36 ± 0.26 |
1.05 |
2.00 |
1.90 |
| SM-24 | 0.31 ± 0.27 | 0.98 | 1.92 | 1.96 |
Q, quintile.