Fig. 3
From: Residential proximity to croplands at birth and childhood leukaemia
Standardized incidence ratio of acute lymphoblastic leukaemia (ALL) in viticulture densitya categories based on population-weighted semi-quartiles. Legend: a The viticulture density in a municipality is defined as the ratio of the total area used for viticulture over the total area of this municipality. The categories were defined as follows: 1st category: municipalities with a total crop density < 5%, 2nd category: municipalities with viticulture density < 5%, 3rd to 10.th categories: 8 groups of municipalities with viticulture density ≥ 5% and equal number of births over the study period (1990–2015). *p-value of the chi-square test of heterogeneity of the viticulture density categories