Table 1
|
Number of subjects in a simple random sample and population by gender and smoking status |
||||||
| Sample |
Population |
|||||
|
|
||||||
| Smoking status |
Smoking status |
|||||
|
|
|
|||||
| Gender |
Yes |
No |
Total |
Yes |
No |
Total |
|
|
||||||
| Male |
n11 |
n10 |
n1• |
N11 |
N10 |
N1• |
| Female |
N21 |
n20 |
n2• |
N21 |
N20 |
N2• |
| n•1 |
n•0 |
n |
N•1 |
N•0 |
N |
|
|
|
||||||
| Description |
Sample Notation |
Population Notation |
||||
|
|
||||||
| Number of smokers |
n•1 |
N•1 |
||||
| # of male smokers |
n11 |
N11 |
||||
| # of female smokers |
n21 |
N21 |
||||
| Number of non-smokers |
n•0 |
N•0 |
||||
| # of male non-smokers |
n10 |
N10 |
||||
| # of female non-smokers |
n20 |
N20 |
||||
| Number of subjects |
n = n•1 + n•0 = n1• + n2• |
N = N•1+ N•0 = N1• + N2• |
||||
| Proportion of male subjects |
 |
ω = N1• /N |
||||
| Smoking prevalence |
 |
π = N•1/N |
||||
| Male smoking prevalence |
 |
πM = N11/N1• |
||||
| Female smoking prevalence |
 |
πF = N21/N2• |
||||
Li et al. Epidemiologic Perspectives & Innovations 2008 5:2 doi:10.1186/1742-5573-5-2 |
||||||