condition mean min max ZT0-3 0.247575575 0.15011565 0.3450355 ZT4-7 2.270195 2.270195 2.270195 ZT8-11 2.05875 2.05875 2.05875 ZT12-15 0 0 0 ZT16-19 0.8858755 0.8858755 0.8858755 ZT20-23 1.2851949999999999 1.2851949999999999 1.2851949999999999