condition mean min max ZT0-3 1.68238 1.52145 1.84331 ZT4-7 2.44466 2.44466 2.44466 ZT8-11 1.1771475 1.1771475 1.1771475 ZT12-15 0 0 0 ZT16-19 2.99145 2.99145 2.99145 ZT20-23 2.31535 2.31535 2.31535