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 0.023595739666666667 0.0 0.047191479333333335 ZT16-19 0.0 0.0 0.0 ZT20-23 0.011617470999999999 0.0 0.023234941999999998