For most infections, calculation of the population-attributable fraction (PAF) relies on the classic formula for population-attributable risk (Cole and Macmahon, 1971): where r represents the relative risk of exposure, and p its prevalence in the population.
A sample size of 422 was determined using the formula for single population proportion based on the assumption s: in the absence of the previous prevalence data on the population under study, and to obtain the maximum sample size, p was assumed to be 0.5.
Techno-economic calculations that examine calcium looping must take into account this decay in capacity, and this has to date been accomplished using a formula for the population distribution of particles in the cycling system.
We developed a more general formula for the population distribution of solid particles in processes involving recirculations, and compared it with the widely used equation in the calculation of several process metrics.
Material and method: A cross-sectional and descriptive study was done on 150 patients diabetic type 2. There were included all of them that have more than 5 years of evolution on the diabetes type 2, the sample was calculated with the averages formula for finite population and the selection was simple random.
The estimated sample size yielded 400 males and 650 females based on the standard formula for the population proportion [ 39].
Urinalysis was not performed, therefore, we could not have data on CKD stage 1 and 2. We have no specific GFR formula for Thai population.
The size of the sample was calculated using the formula for a population proportion taken into account the pilot test sample data which resulted in 1,400 prescriptions.
Using the formula for single population proportions, we made the following assumptions: proportion of mothers knowing obstetric danger signs during pregnancy to be 23.8% [ 5], confidence level 95%, absolute precision +/-5%, design effect 2, and non-response rate 5%.
The sample size was calculated using Epi Info version 7. A sample size of 845 was calculated using formula for single population proportion, taking the largest p value, prevalence (P) of delivery attended by skilled personnel which is 10%% for the country, assuming a design effect of 2, a margin of error of 3%% at 95%% confidence interval, and a non-response rate of 10%%.
