The changes occuring in the disease frequency over many years is called
. long term or secular trends implies changes in the occurrence of disease over a long period of time.generally several years or decades.a secular trend implies a consistent tendency to change in a paicular direction or a definitive movement in one direction. ref:park&;s textbook,ed 22,pg no 63
Cyclic trend
Seasonal trend
Secular trend
None of the above
Epidemiology