condition mean min max ZT0-3 1.547575 1.547575 1.547575 ZT4-7 1.1920549999999999 1.1920549999999999 1.1920549999999999 ZT8-11 0.863631 0.863631 0.863631 ZT12-15 0.9963704999999999 0.9963704999999999 0.9963704999999999 ZT16-19 3.4068050000000003 3.4068050000000003 3.4068050000000003 ZT20-23 1.79233 1.79233 1.79233