condition mean min max ZT0-3 76.62337500000001 68.5697 84.67705000000001 ZT4-7 7.48805 7.48805 7.48805 ZT8-11 14.49735 14.49735 14.49735 ZT12-15 0 0 0 ZT16-19 53.1619 53.1619 53.1619 ZT20-23 20.2018 20.2018 20.2018