condition mean min max ZT0-3 2.700875 2.700805 2.700945 ZT4-7 2.579405 2.579405 2.579405 ZT8-11 3.774545 3.774545 3.774545 ZT12-15 0 0 0 ZT16-19 3.88379 3.88379 3.88379 ZT20-23 3.319245 3.319245 3.319245