Older allergy testing methods......

Does anyone here know the difference in the SPT result interpretations now versus 30 yrs ago. I'm asking because my mother in law found one of my husband's SPT result sheets. He had a 2+ beside "peanut". She said she thought it was 2 out of 6. She said she never remembers my husband having a problem eating peanuts, but she tried to avoid whatever was on the list (I'm pretty sure she didn't avoid "may contain" items). He was severely allergic to chocolate, and was asthmatic, but outgrew all of it. My daughter's SPT was "moderately" positive and she has no other known allergies, no asthma either. Any thoughts on the older test versus current? I'm just trying to decide whether or not her results were comparable to his and if there's a SHRED of a chance that she could outgrow this. Just wondering. Thanks in advance.
Edit: I guess I should mention that it was mid-to-late 1970's when my husband was tested. He had NUMEROUS food, dust and dander allergies, and had asthma as well. You'd never know it now, he outgrew all of it.