True regarding secular trends-: (A) Changes in disease pattern in terms of months, (B) Changes in disease pattern seasonally, (C) Changes in disease pattern over a sho period of timer, (D) Changes in disease pattern over a long period of time
Answer is D. .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