Hi, thanks for feedback!
Yes, only part of the questions are used to calculate the biological age.
The goal of our study is to rely on this estimated bioage to score lifestyles and dietary supplements for their pro-longevity effects. So, the other part of questions is related to lifestyles and is not accounted in calculation of bioage itself.
Q8 about diarrhea is used in bioage calculation. Our biological aging marker was intentionally composed of questions related to current health status, i.e. those that may fluctuate within a month or so. We outlined the reasons to do so in our recent manuscript on longitudinal blood tests, that is under review right now and available on bioRxiv (https://doi.org/10.1101/618876).
As for Q4, I think resistance training does count. Our model is based on NHANES study, so most of the questions are asked exactly as in NHANES questionnaire. Q4 is exactly regarding vigorous physical activity.
Q18 is just a demographics question.
As for Q15, I think cooking large amounts of turmeric should mean the answer yes, for curcumin intake in our survey.
The essential difference of our model from Aging.ai's is that our model is not intended to predict age, but is based on hazards model and predicts the difference in years of health-span among an age-matched cohort of individuals. We have investigated both approaches and found that hazards model is more appropriate and more sensitive to variations in health status.