condition mean min max ZT0-3 3171.2 3171.2 3171.2 ZT4-7 3645.4 3645.4 3645.4 ZT8-11 3544.25 3544.25 3544.25 ZT12-15 4180.65 4180.65 4180.65 ZT16-19 3499.3999999999996 3499.3999999999996 3499.3999999999996 ZT20-23 2881.4 2881.4 2881.4