True regarding secular trends-
.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
Changes in disease pattern in terms of months
Changes in disease pattern seasonally
Changes in disease pattern over a sho period of timer
Changes in disease pattern over a long period of time
Epidemiology