Studies:

Scope: human

Required.

Type: integer (or empty)

Description: Number of days between collection of this sample and collection of the first sample from that subject. That is, for a timeseries, it will always start with 0. In some cases, a study contains multiple samples, but the timing is not clear. If a timeframe is given (e.g. "after approximately four weeks"), we translate that to the number of days. That is, if the paper specifies intervals in months, convert to approximate days (1 month ≈ 30 days, etc.). If intervals are vague ("several weeks later"), leave timepoint empty. Likewise, if the relative timing of samples cannot be inferred, the timepoint will be left empty.