To test the knowledge.
Curable, but not serious.
Uncurable, but not serious
Curable, but serious
Uncurable and serious
9%
11%
10%
12%
1495
1490
1595
1590
Primary, secondary, intermidiate, and final
Primary, secondary, latent, tertiary
Primary, latent, hidden, tertiary
Basic, mild, intermidiatem and final