timestamp shift/anchor

[dcn2123]

For sites that have to de-identify timestamps for the first submission. Is there any standard date shift or anchor date that we are supposed to be using? I checked through the first data request but could not find anything

[del42]

@dcn2123 I have seen a lot of site do 1-365 days random day backward shifting. Emory is planning to following this standard.
My understanding is that, sites will have to do their own shifting the way their institutes does or follow common standard. We won't get instruction for this.

Personally, selecting days that are multiples of 7 (such as 7, 14, 21, etc.) within the range of 1 to 365 days to shift dates backward is the best. This method can effectively address issues related to the day of the week.

[Chesterguan]

I did the random shifting now between -15 to 15 days. However, from my colleagues, they also mentioned some specific requirements for patients older than 90 years old.

I would recommend ChoRUS to do an extra date shifting before data publishing with a standard policy.

[del42]

@Chesterguan Yes. We do have over 90 year old patients defaulted to 90 years as well. I believe we have to do central date shift, since it is written in the IRB.