condition mean min max ZT0-3 4.9 4.9 4.9 ZT4-7 3.8 3.8 3.8 ZT8-11 23.5 23.5 23.5 ZT12-15 8.9 8.9 8.9 ZT16-19 6.15 6.15 6.15 ZT20-23 10.399999999999999 10.399999999999999 10.399999999999999