condition mean min max ZT0-3 16.95 16.95 16.95 ZT4-7 34.7 34.7 34.7 ZT8-11 16.75 16.75 16.75 ZT12-15 10.399999999999999 10.399999999999999 10.399999999999999 ZT16-19 4.15 4.15 4.15 ZT20-23 10.85 10.85 10.85