condition mean min max ZT0-3 3.2289425 2.2707050000000004 4.18718 ZT4-7 2.7364550000000003 2.7364550000000003 2.7364550000000003 ZT8-11 2.7264 2.7264 2.7264 ZT12-15 0 0 0 ZT16-19 2.676565 2.676565 2.676565 ZT20-23 2.69398 2.69398 2.69398