condition mean min max ZT0-3 0.040855166666666665 0.0 0.1225655 ZT4-7 0.0 0.0 0.0 ZT8-11 0.245661 0.245661 0.245661 ZT12-15 0.133637 0.0 0.267274 ZT16-19 0.0 0.0 0.0 ZT20-23 0.518 0.518 0.518