condition mean min max ZT0-3 556.5999999999999 556.5999999999999 556.5999999999999 ZT4-7 489.4 489.4 489.4 ZT8-11 486.95 486.95 486.95 ZT12-15 412.35 412.35 412.35 ZT16-19 451.1 451.1 451.1 ZT20-23 564.8 564.8 564.8