condition mean min max ZT0-3 1.70558 1.70558 1.70558 ZT4-7 2.97239 2.97239 2.97239 ZT8-11 4.041320000000001 4.041320000000001 4.041320000000001 ZT12-15 3.29268 3.29268 3.29268 ZT16-19 4.853043333333334 4.853043333333334 4.853043333333334 ZT20-23 2.53132 2.53132 2.53132