It is funny to notice in the message of "Paddlerow" that there could be great differences in the way the examination was performed by a nurse according to her age or her character or habits
May be it was different at a school or sports physical examination where I believe that there were official instructions, so the weigh-ins of boys students might be performed in underwears or stark naked according to the instructions, sometimes it could be mentioned on the medical form that the nurse had to fill
at least I think that it was like that in France
But I presume that "Paddlerow" is talking of physical examinations in a private doctor office
So it was very different according to the age of the nurse, the oldest one required a full nudity for a weigh-in while the youngest one asked only to be in underwear and it was the same for shots ; the oldest one did them always in the butts while the youngest did them always in the arms.
It shows that there were no regulations about the state of undressing of a boy at a weigh-in and the shots, each nurse could do as she preferred or was instructed to do during her studies in a school nurse.
it was not surprising that it was the oldest one who was very"old school" and did not mind about the shyness towards nudity of the boys.
Anyway of course I would have preferred to be examined by the youngest nurse !