Social & Preventive Medicine Disease which shows changes in occurrence (of disease) over a long period of time: March 2013 (a, h) A Cyclic trend B Secular trend C Seasonal trend D Sho term fluctuations 💡 Explanation Disease which shows changes in occurrence (of disease) over a long period of time: March 2013 (a, h) ✓ Correct Answer: B. Secular trend