Analysing data with baseline and followup measurements

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Before and After by Eric.Ray, Attribution License

In many studies you want to look at how much change their has been over time, or after some sort of intervention. To study this you might collect data at two timepoints, like at baseline and then at another time.

In this short article from the British Medical Journal, Vickers and Altman explain different methods to analyse such data and when each is useful.

Vickers Andrew J, Altman Douglas G. Analysing controlled trials with baseline and follow up measurements BMJ 2001; 323:1123

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