condition mean min max ZT0-3 0.016022028166666667 0.014991237 0.017052819333333333 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 0.0074762890000000005 0.0 0.014952578000000001 ZT20-23 0.0 0.0 0.0