Fig. 2From: Validation of the global lung initiative 2012 multi-ethnic spirometric reference equations in healthy urban Zimbabwean 7–13 year-old school children: a cross-sectional observational studyScatterplots for GLI2012 z-scores for a FVC, b FEV1, c FEV1/FVC, d MMEF. Plots also demonstrate the distribution of the z-score values around 0, 1.645 and − 1.645Back to article page