condition mean min max ZT0-3 24.688864055 19.709434299999998 29.66829381 ZT4-7 43.399282725 32.628122205 54.170443245 ZT8-11 69.17846053 59.578431554999995 78.778489505 ZT12-15 84.7171286625 82.507681665 86.92657566 ZT16-19 44.9174079325 44.24765431 45.587161554999994 ZT20-23 45.480344720000005 44.071299135000004 46.889390305000006