condition mean min max ZT0-3 5.05 5.05 5.05 ZT4-7 0.3 0.3 0.3 ZT8-11 14.399999999999999 14.399999999999999 14.399999999999999 ZT12-15 7.9 7.9 7.9 ZT16-19 14.95 14.95 14.95 ZT20-23 11.5 11.5 11.5