condition mean min max ZT0-3 6.65 6.65 6.65 ZT4-7 0.5 0.5 0.5 ZT8-11 1.15 1.15 1.15 ZT12-15 9.399999999999999 9.399999999999999 9.399999999999999 ZT16-19 2.65 2.65 2.65 ZT20-23 4.8 4.8 4.8