condition mean min max ZT0-3 8.140619008 6.281167926 10.00007009 ZT4-7 9.27886875125 8.1595547525 10.39818275 ZT8-11 9.798381113000001 9.785233775 9.811528451000001 ZT12-15 8.6517936325 7.9682166545 9.3353706105 ZT16-19 14.011570998749999 10.0830990225 17.940042974999997 ZT20-23 26.6346403175 22.46211029 30.807170345