condition mean min max ZT0-3 0.7714415 0.611788 0.931095 ZT4-7 0.6590005 0.6590005 0.6590005 ZT8-11 1.86811 1.86811 1.86811 ZT12-15 0 0 0 ZT16-19 1.457315 1.457315 1.457315 ZT20-23 1.0213235 1.0213235 1.0213235