Fig. 5From: The validity of electronic health data for measuring smoking status: a systematic review and meta-analysisDistribution of selected algorithm validity measures, stratified by algorithm data structure. Note: The centre horizontal line within the box represents the median (50th percentile); upper and lower bounds of the box indicate the 25th and 75th percentiles; dashed lines connect the maximum and minimum; circles represent outliers. PPV = positive predictive valueBack to article page