How does slimmer of the year work?

So they announced group slimmer of the year last week. The lady who won it said she'd acheived her target (4st) in 14 months. I didn't really understand because she hasn't lost the most amount of weight in the group, it took over a year and it doesn't tie in with any year dates.
Not taking it away from her obviously, she's done really well but could someone explain how it works please? Like many other sw awards it dossn't seem to make much intrinsic sense.
Thanks!
 
The information gets sent directly to the consultant - it's possibly the individual who has been a member for a whole year (or not rejoined/restarted).
Sorry not a definite answer.
 
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