condition mean min max ZT0-3 19.582300000000004 19.07075 20.093850000000003 ZT4-7 21.0751 21.0751 21.0751 ZT8-11 34.3761 34.3761 34.3761 ZT12-15 0 0 0 ZT16-19 33.4619 33.4619 33.4619 ZT20-23 23.613999999999997 23.613999999999997 23.613999999999997