Question: Contrary to previous studies, the above model did not show a significant relationship between treatment outcome (positive pregnancy test) and serum vitamin D levels. What

Contrary to previous studies, the above model did not show a significant relationship between treatment outcome (positive pregnancy test) and serum vitamin D levels. What kind of data problem (quasi complete separation, zero cells, multicolinearity)could be responsible for the lack of association between treatment outcome and serum vitamin D levels? To confirm your suspicions, what additional analyses would you carry out

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