condition mean min max ZT0-3 4.71148625 1.3932425 8.02973 ZT4-7 2.83824 2.83824 2.83824 ZT8-11 5.16249 5.16249 5.16249 ZT12-15 0 0 0 ZT16-19 7.893425000000001 7.893425000000001 7.893425000000001 ZT20-23 2.796355 2.796355 2.796355