condition mean min max ZT0-3 1.9581525 1.674325 2.24198 ZT4-7 1.208181 1.208181 1.208181 ZT8-11 2.904655 2.904655 2.904655 ZT12-15 0 0 0 ZT16-19 2.2577249999999998 2.2577249999999998 2.2577249999999998 ZT20-23 2.91714 2.91714 2.91714