If we do another study for 10-20 years in forward direction after retrospective coho study, it now is known as:-
High-Yield Explanation
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)