condition mean min max ZT0-3 20.05835 20.05835 20.05835 ZT4-7 16.4374 16.4374 16.4374 ZT8-11 16.4906 16.4906 16.4906 ZT12-15 16.63895 16.63895 16.63895 ZT16-19 24.745199999999997 24.745199999999997 24.745199999999997 ZT20-23 22.48975 22.48975 22.48975