condition mean min max ZT0-3 0.9329369999999999 0.9329369999999999 0.9329369999999999 ZT4-7 0.873934 0.873934 0.873934 ZT8-11 1.003191 1.003191 1.003191 ZT12-15 0.5455075 0.5455075 0.5455075 ZT16-19 0.93512 0.93512 0.93512 ZT20-23 0.588776 0.588776 0.588776