Everything I have read thus far regarding the modified Baecke Questionnaire (BQ) describes the scoring instructions and the validity of the instrument. The original BQ describes classifying results based on tertiles, but fails to offer cut-points or even a range of what is an acceptable moderate or vigorous activity score. It seems subjective. Any references that suggest/used clear cut-points for physical activity level classification?

Are there clear cut-points available to classify PA level as low, moderate, or vigorous using the modified Baecke Questionnaire?