In a PICO question comparing 'evaluating children at 3 months' versus 'evaluating children at 6 months' to detect early caries, which evaluation interval would typically be considered the 'I' (Intervention/Index approach being studied)?

In the PICO framework (Population, Intervention, Comparison, Outcome), when comparing two screening/evaluation intervals, the newer or index approach being tested (here, the more frequent 3-month evaluation) is typically framed as the Intervention, while the alternative/standard interval (6 months) serves as the Comparison — though which interval is labeled 'I' vs. 'C' can depend on how the specific research question is framed by the study authors.