I (finally) got a call back from NWCR (coincidence or do they track internet mentions – don’t know, don’t care).
Here is what I was told:
NWCR only tracks their participants for 10 years. After that they are no longer a “member”. So none of their data exceeds 10 years. If a participant gains the weight back during that 10 years, they are still listed as a “member”.
So NWCR currently is tracking 5,000 people; and we don’t know how many of those are maintaining their weight loss.
Even though, they only track their members for 10 years, their website says –
Duration of successful weight loss has ranged from 1 year to 66 years!
I can only guess this means some people join long after they have begun weight loss maintenance.
And their website also says:
Registry members have lost an average of 66 lbs and kept it off for 5.5 years.
So they track for 10 years, and the average weight loss maintenance is 5.5 years. Hmmm.
As Whaliam points out, it doesn’t really mean much from a scientific point of view; but now when someone starts talking about the NWCR, you’ll have some info to share (after you tell them about my cracker-chewing fat ass!).