If we do another study for 10-20 years in forward direction after retrospective coho study, it now is known as:-
Mixed Coho Studies Combination of Retrospective Coho study + Prospective coho study The coho is identified from past records and is assessed till date for the outcome. (Retrospective coho) The same coho is followed up prospectively into future for fuher assessment of outcome. (Prospective coho)
Mixed Coho study
Retrospective coho study
Nested case control study
Mixed case control study
Case Control Study, Combined Designs