condition mean min max ZT0-3 4.89831 4.769475 5.027145 ZT4-7 4.783025 4.783025 4.783025 ZT8-11 6.9221 6.9221 6.9221 ZT12-15 0 0 0 ZT16-19 12.68985 12.68985 12.68985 ZT20-23 10.71205 10.71205 10.71205