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50th, 90th, and 95th percentiles by age and site for mean SpO2
SpO2=oxyhaemoglobin saturation. Estimated percentiles were obtained from a generalised additive regression model for location, shape, and scale fitted to SpO2 data. We plotted the observed data points in grey. Smooth lines represent site-specific percentiles by age. The seven SpO2 values 80% or lower in Peru are plotted in grey by age at the bottom of the panel.
