condition mean min max ZT0-3 0.27627674999999996 0.2446915 0.30786199999999997 ZT4-7 0.186168 0.186168 0.186168 ZT8-11 0.560783 0.560783 0.560783 ZT12-15 0 0 0 ZT16-19 0.45376950000000005 0.45376950000000005 0.45376950000000005 ZT20-23 0.21285300000000001 0.21285300000000001 0.21285300000000001