condition mean min max ZT0-3 4.00528 4.00528 4.00528 ZT4-7 3.72256 3.72256 3.72256 ZT8-11 3.9436150000000003 3.9436150000000003 3.9436150000000003 ZT12-15 4.252035 4.252035 4.252035 ZT16-19 4.852745 4.852745 4.852745 ZT20-23 4.894335 4.894335 4.894335