condition mean min max ZT0-3 0.46637925 0.380343 0.5524155000000001 ZT4-7 0.2855288 0.2855288 0.2855288 ZT8-11 0.19338149999999998 0.19338149999999998 0.19338149999999998 ZT12-15 0 0 0 ZT16-19 0.3071615 0.3071615 0.3071615 ZT20-23 0.3797775 0.3797775 0.3797775