condition mean min max ZT0-3 20.7369 17.9376 23.5362 ZT4-7 22.390050000000002 22.390050000000002 22.390050000000002 ZT8-11 12.81495 12.81495 12.81495 ZT12-15 0 0 0 ZT16-19 26.046950000000002 26.046950000000002 26.046950000000002 ZT20-23 26.155450000000002 26.155450000000002 26.155450000000002