Table 1.
Name | Stratum definition | Stratum proportion |
---|---|---|
Always-diseased (ad) | & | |
Never-diseased (nd) | & | |
Disease-harmed (dh) | & | |
Disease-protected (dp) | & |
Name | Stratum definition | Stratum proportion |
---|---|---|
Always-diseased (ad) | & | |
Never-diseased (nd) | & | |
Disease-harmed (dh) | & | |
Disease-protected (dp) | & |