condition mean min max ZT0-3 6.683775000000001 5.952825 7.414725000000001 ZT4-7 3.754225 3.754225 3.754225 ZT8-11 3.236685 3.236685 3.236685 ZT12-15 0 0 0 ZT16-19 6.975235 6.975235 6.975235 ZT20-23 3.982075 3.982075 3.982075