condition mean min max ZT0-3 15.687075 15.6801 15.694049999999999 ZT4-7 19.1044 19.1044 19.1044 ZT8-11 16.37425 16.37425 16.37425 ZT12-15 0 0 0 ZT16-19 16.498199999999997 16.498199999999997 16.498199999999997 ZT20-23 17.827150000000003 17.827150000000003 17.827150000000003