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Stratified progression free survival analysis on the effect of consolidation radiotherapy. Circles are proportional to stratum size i.e., overall number of patients in stratum; color of circles reflects number of trials in stratum i.e., from black (seven trials) to light grey (one trial); age, stage, and bulky disease are characteristics of the study population and cannot be interpreted on the individual participant level (ecological fallacy). CI: Confidence Interval.
