condition mean min max ZT0-3 4.577075 3.076445 6.077705 ZT4-7 12.23427 12.23427 12.23427 ZT8-11 3.131635 3.131635 3.131635 ZT12-15 0 0 0 ZT16-19 3.0334 3.0334 3.0334 ZT20-23 3.05545 3.05545 3.05545