condition mean min max ZT0-3 137.05525 124.765 149.34550000000002 ZT4-7 40.9319 40.9319 40.9319 ZT8-11 84.93545 84.93545 84.93545 ZT12-15 0 0 0 ZT16-19 247.707 247.707 247.707 ZT20-23 141.4725 141.4725 141.4725