condition mean min max ZT0-3 2244.5 2244.5 2244.5 ZT4-7 3113.9 3113.9 3113.9 ZT8-11 3716.6 3716.6 3716.6 ZT12-15 3305.45 3305.45 3305.45 ZT16-19 2386.35 2386.35 2386.35 ZT20-23 2164.2 2164.2 2164.2