condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.29447243116666666 0.0 0.5889448623333333 ZT20-23 0.4301188416666667 0.37008034133333334 0.490157342