I do wonder if the number might be inflated if it was data gathered whilst assessing people for their suitability for military service, I have the impression it's kind of a cliche that wetting the bed is a good way to get out an unwanted spell in the military, since it's pretty much impossible to prove that someone is or isn't a genuine bedwetter.
I looked through the medical criteria for the German military(Germany technically still has conscription, it's just been suspended since 2011) and there is a special note that although it means automatic exclusion from serving, anyone who self-reports as a bedwetter during the standard medical assessment has to have a special interview with either a urologist or a psychologist depending on whether the cause is believed to be a urinary system defect, or just pure bedwetting with no specific cause. I take that to be a acknowledgement that someone reporting it might not be telling the whole truth!
A German man I know once told a story that he went to a lawyer to ask for advice on getting out of conscription and the answer he got was "how do you feel about bedwetting"! I'm not actually German, so quite how much this was passed around as an idea for avoiding military service I'm not sure.
I couldn't find any detailed information about how Israeli army would deal with someone reporting bedwetting so I guess it's either secret, in Hebrew, or both.