condition mean min max ZT0-3 1.8925239999999999 1.8925239999999999 1.8925239999999999 ZT4-7 2.630675 2.630675 2.630675 ZT8-11 0.839924 0.839924 0.839924 ZT12-15 1.1270495 1.1270495 1.1270495 ZT16-19 1.1546965 1.1546965 1.1546965 ZT20-23 0.6088985 0.6088985 0.6088985