condition mean min max ZT0-3 0.8600028333333334 0.722904 0.9346075 ZT4-7 2.091915 2.091915 2.091915 ZT8-11 1.651595 1.651595 1.651595 ZT12-15 2.683515 2.552175 2.814855 ZT16-19 2.09303 2.09303 2.09303 ZT20-23 1.92091 1.92091 1.92091