Fig. 3From: Population-level indicators associated with hormonal contraception use: a register-based matched case–control studySignificance levels of sociodemographic differences between HC users and non-users across 309 Finnish municipalities. a Socioeconomic status; b Education; c Annual income. P-values are from chi-squared test and t-test. (maps created with R software version 3.5.1, URL http://www.rstudio.com/)Back to article page