i don't what 1:32 and 1:1024 indicate, but this is how an outsider like myself, with no knowledge of the field, might read this (I'm guessing that in a figure like 1:32, the number to the left of the colon will always be a single digit number):
"We got nine point two percent of serums positive, between one thirty-two (or: one three two) and one ten twenty-four (or: one one zero two four