condition mean min max ZT0-3 3.5325933333333337 1.40426 5.29028 ZT4-7 10.032615 10.032615 10.032615 ZT8-11 18.05475 18.05475 18.05475 ZT12-15 22.983975 17.3018 28.666150000000002 ZT16-19 28.14995 28.14995 28.14995 ZT20-23 33.1625 33.1625 33.1625