condition mean min max ZT0-3 5.6229233333333335 5.6229233333333335 5.6229233333333335 ZT4-7 4.687965 4.687965 4.687965 ZT8-11 6.1688 6.1688 6.1688 ZT12-15 2.03597 2.03597 2.03597 ZT16-19 2.73595 2.73595 2.73595 ZT20-23 2.5354200000000002 2.5354200000000002 2.5354200000000002