Equal interval reduces which bias-
Bias may arise due to errors of assessment of the outcome due to the human element. 3 sources: subject variation, observer bias , bias in evaluation. Selection bias: cases and controls may not be representative of cases and controls in population. There may be a systemic difference in characteristics between cases and controls. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 81
Selection bias
Berkesonian bias
Interviewer bias
None
Epidemiology