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Sample size calculation
Pre requisite to for sample size
calculation
Proportion of disease in the case-p0
 This extracted from LR, pilot study or assumption(50%
Proportion of disease in the control-p1
 This extracted from LR, pilot study or assumption(50%
Ratio of case to control-r( 1;2 or etc)
P-value(-0.05), Z /(1.96)
z is 0.84 at 80% power and 1.28 at 90%
Sample size calculation for cohort
example
The proportion who are smoker and hypertensive is 36.2
The proportion who are not drinker and hypertensive is 16.8
Calculate sample size
Sample size calculation for case control
Proportion of disease in the case-p0
 This extracted from LR, pilot study or assumption(50%
Proportion of disease in the control-p1
 This extracted from LR, pilot study or assumption(50%
Ratio of case to control-r( 1;2 or etc)
P-value(-0.05), Z /(1.96)
z is 0.84 at 80% power and 1.28 at 90%
sample size A5.pptx
sample size A5.pptx
sample size A5.pptx

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sample size A5.pptx

  • 2. Pre requisite to for sample size calculation Proportion of disease in the case-p0  This extracted from LR, pilot study or assumption(50% Proportion of disease in the control-p1  This extracted from LR, pilot study or assumption(50% Ratio of case to control-r( 1;2 or etc) P-value(-0.05), Z /(1.96) z is 0.84 at 80% power and 1.28 at 90%
  • 3.
  • 4.
  • 5.
  • 7.
  • 8.
  • 9.
  • 10. example The proportion who are smoker and hypertensive is 36.2 The proportion who are not drinker and hypertensive is 16.8 Calculate sample size
  • 11.
  • 12.
  • 13.
  • 14. Sample size calculation for case control Proportion of disease in the case-p0  This extracted from LR, pilot study or assumption(50% Proportion of disease in the control-p1  This extracted from LR, pilot study or assumption(50% Ratio of case to control-r( 1;2 or etc) P-value(-0.05), Z /(1.96) z is 0.84 at 80% power and 1.28 at 90%