condition mean min max ZT0-3 4.3732050000000005 3.9606500000000002 4.750845 ZT4-7 4.149105 4.149105 4.149105 ZT8-11 5.04519 5.04519 5.04519 ZT12-15 8.08706 7.385149999999999 8.788969999999999 ZT16-19 6.236075 6.236075 6.236075 ZT20-23 4.8626000000000005 4.8626000000000005 4.8626000000000005