Take the 2017 calendar window to be on the supplied month scale. Intersecting each follow-up interval with this window and translating to time since diagnosis gives:
  • patient 1: delayed entry at duration 10 and censoring at 22;
  • patient 3: delayed entry at 8 and death at 15;
  • patient 4: delayed entry at 4 and censoring at 7;
  • patient 5: delayed entry at 2 and censoring at 14;
  • patient 6: entry at 0 and censoring at 9;
  • patient 7: entry at 0 and death at 6;
  • patient 8: entry at 0 and censoring at 6;
  • patient 9: entry at 0 and censoring at 4.
Patient 2 died before the period and patient 10 entered after it, so neither contributes. At duration 6, patients 4, 5, 6, 7, and 8 are at risk, giving factor . At duration 15, patients 1 and 3 are at risk, giving factor . Therefore the period Kaplan–Meier estimator is
(1)
over the range supported by the period data.

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