Single Imputation BOCF

Hi there!

There is an example in this topic that confuses me.

Could you please explain why we should use BOCF (Baseline Observation Carried Forward) here, while we clearly see, that concentration is decreasing?
So as for me in this case better to use NOCB (Next Observation Carried Backward).

And why there is no technique when we calculate average from values that goes before and after of missing value?

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