BMC Medical Research Methodology

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

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ISSN: 1471-2288

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