Fig. 4: Correlations among clinical severity score (CSS), enzyme activity, C14:1 level in initial dried blood spots, and diagnostic ratios.

Correlations between CSS and enzyme activity (a), or C14:1 level in initial dried blood spots (b). Correlations between C14:1 level in initial dried blood spots and 13C-C2/13C-C18 (c), or 13C-C2/13C-C18:1 (d). The Spearman’s rank correlation coefficient ρ and p-values are indicated.