Abstract
The study by Kenny et al. is of considerable importance. They concluded that there was a weak association between the ergothioneine levels and maternal age, and if a threshold was set at the 90th percentile of the reference range in the control population (≥ 462 ng/mL), only one of these 97 women (1%) developed preeclampsia, versus 96/397 (24.2%) whose ergothioneine level was below this threshold. These results suggest that there might be a dichotomized association between ergothioneine concentrations and preeclampsia; and only a high ergothioneine level over 90th percentile of the control population could be protective against preeclampsia.With the kind supply of the dataset from the authors, I had performed some further analysis using univariable as well as multivariable analyses, allowing non-linearity between ergothioneine concentrations and risk of preeclampsia using a 3-knot restricted cubic spline function. The univariable results showed that ergothioneine had a significant non-linear association with preeclampsia and it would start to offer protective effect from 300ng/mL onward. The results were similar to the multivariable analysis. In addition, the analysis also confirmed that body mass index (BMI) was significantly associated with an increased risk of preeclampsia.
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