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Table 1 Intervals 1, 2 and 3 by launch period

From: Drug safety: withdrawn medications are only part of the picture

Launch period Interval Number of medications Median (years) Interquartile range (years)
Pre-1961 1 187 20 9–32
2 187 37 27–57
3 187 16 6–28
1961–1975 1 128a 8 3–15
2 131 17 10–22
3 128a 5 1–11
1976–1990 1 75 3 2–5
2 75 6 4–12
3 75 2 0–6
1991–2013 1 69 1 0–4
2 69 3 1–6
3 69 1 0–2
  1. aYear of the first ADR report related to the reason for withdrawal was missing for three medications