condition mean min max ZT0-3 4.5011425 4.42305 4.579235000000001 ZT4-7 6.3744250000000005 6.3744250000000005 6.3744250000000005 ZT8-11 4.083595 4.083595 4.083595 ZT12-15 0 0 0 ZT16-19 3.107825 3.107825 3.107825 ZT20-23 11.9463 11.9463 11.9463