condition mean min max ZT0-3 39.24145 39.24145 39.24145 ZT4-7 21.69845 21.69845 21.69845 ZT8-11 18.38655 18.38655 18.38655 ZT12-15 14.735949999999999 14.735949999999999 14.735949999999999 ZT16-19 30.4801 30.4801 30.4801 ZT20-23 30.49345 30.49345 30.49345