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Table 1 Numbers of women by the length of exposure (years) at the time of stopping exposure in the EPHT trial (May 2004).

From: Experiences of a long-term randomized controlled prevention trial in a maiden environment: Estonian Postmenopausal Hormone Therapy trial

Sub-study Arm Length of exposure (years)  
   2–2.9 3–3.9 4+ Total
Blind Hormone therapy 89 198 128 415
  Placebo 85 182 114 381
Non-blind Open-label hormone therapy 127 212 164 503
  Control 117 216 191 524
Total   418 808 597 1823