condition mean min max ZT0-3 43.5896 43.5896 43.5896 ZT4-7 64.68545 64.68545 64.68545 ZT8-11 2.66743 2.66743 2.66743 ZT12-15 0.25400100000000003 0.25400100000000003 0.25400100000000003 ZT16-19 0.568845 0.568845 0.568845 ZT20-23 3.308165 3.308165 3.308165