condition mean min max ZT0-3 0.391149293 0.17752098 0.604777606 ZT4-7 2.165714369 1.6184623105 2.7129664275 ZT8-11 3.032028901 2.9361810944999998 3.1278767075 ZT12-15 1.4424462635 0.8184042060000001 2.066488321 ZT16-19 0.76026054275 0.522555979 0.9979651065 ZT20-23 0.6500538810000001 0.42276497700000004 0.877342785