condition mean min max ZT0-3 0.6663996666666666 0.538897 0.7311765 ZT4-7 0.548055 0.548055 0.548055 ZT8-11 0.4134415 0.4134415 0.4134415 ZT12-15 0.5361615 0.31886 0.753463 ZT16-19 0.5394415 0.5394415 0.5394415 ZT20-23 0.7213895 0.7213895 0.7213895