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An Assessment of the NIH Women's Health Initiative (1993) / Chapter Skim
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Appendix J: NIH Power Calculations
Pages 127-132

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From page 127...
... J ~ Par Cnicu1~1ions1 Repr1~1ed Tab permission Tom the June 28, 1993 HI Protocot pages 77-~.
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From page 128...
... Perom* ~e cases Total sample size Average Intervention follow-up effect 0~)
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From page 129...
... Pe~ta~e cases Total sample size Average Intenrenffon follow~p effect (y)
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From page 130...
... PERT versus Control: Breast Cancer.
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From page 131...
... . Sample size Control Detention 42,000 4S,000 S4,000 1.07 0.93 33 37 41 1.07 0.92 40 45 49 1.07 0.91 47 S2 57 1.61 132 77 1.61 1~9 86 1.60 I~5 92 37 45 S2 83 90 gS 87 93 97 Power(%)
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From page 132...
... . (aid Calaum/~'tamin D ven;us Control: Combined F=ctums fThe percentages of cases and powers in this table are based upon our original age distribution assump' i.e., 50-59, 60-69, 70-79 year olds enter in me ratio 2~2.1 and hence are conservative estimates.)
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Key Terms

  • coronary heart
  • pert versus
  • heart disease
  • age distribution
  • total sample

  • distribution assumptions
  • original age
  • combined fractures
  • breast cancer
  • sample size

  • olds enter
  • conservative estimates
  • increase due


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