condition mean min max ZT0-3 37.75 37.75 37.75 ZT4-7 7.9 7.9 7.9 ZT8-11 32.4 32.4 32.4 ZT12-15 29.95 29.95 29.95 ZT16-19 11.399999999999999 11.399999999999999 11.399999999999999 ZT20-23 64.25 64.25 64.25