condition mean min max ZT0-3 17.366799999999998 17.366799999999998 17.366799999999998 ZT4-7 24.776649999999997 24.776649999999997 24.776649999999997 ZT8-11 18.7502 18.7502 18.7502 ZT12-15 11.2164 11.2164 11.2164 ZT16-19 11.66015 11.66015 11.66015 ZT20-23 12.11665 12.11665 12.11665