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Table 1 Mean follow-up between the two groups and relative differences between patients at every stage

From: Prognosis of screen-detected breast cancers: results of a population based study

Stage Distribution of those exposed to screening Time of mean follow-up in thoxe exposed to screening (months) Distribution in non screen-detected Time of mean follow-up in non-screen-detected (months) Differences between mean follow-up (months)
I 357 54.13 199 54.01 0.12
II 115 51.39 156 48.49 2.9
III 2 50.58 30 49 1.56
IV 8 32.57 26 36.32 -3.75