Figure 2.

Seasonal patterns of vitamin B6 biomarker levels in plasma of Gambian women. Pyridoxal = light grey; pyridoxic acid = dark grey; pyridoxal phosphate = black. The data were derived from 315 samples on 52 women observed across the year. Curves show the plasma concentration (mg/dl) estimated using generalised least squares random effects fitting the first four Fourier terms.