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Fig. 2 | BMC Medical Research Methodology

Fig. 2

From: Comparison of six statistical methods for interrupted time series studies: empirical evaluation of 190 published series

Fig. 2

Flowchart of selected datasets. Green boxes denote the number of included studies and time series, blue boxes denote the numbers corresponding to dataset collection, and orange boxes denote the numbers corresponding to dataset exclusion.a Some studies included multiple interrupted time series, hence the number of time series is greater than the number of studies. b As multiple methods were potentially available for obtaining an interrupted time series dataset (e.g. some datasets were obtained via both email contact and digital extraction), the numerators across the data sources do not sum to 230. c For each interrupted time series, only one data source was selected for analysis, yielding a total of 190 unique time series datasets. The hierarchy for the data source selection was (i) published data, (ii) contact with authors, and (iii) digital extraction

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