condition mean min max ZT0-3 4030.05 4030.05 4030.05 ZT4-7 1900.5 1900.5 1900.5 ZT8-11 1800.6999999999998 1800.6999999999998 1800.6999999999998 ZT12-15 2441.1000000000004 2441.1000000000004 2441.1000000000004 ZT16-19 2517.25 2517.25 2517.25 ZT20-23 3084.0 3084.0 3084.0