condition mean min max ZT0-3 4.401158333333334 4.324260000000001 4.47973 ZT4-7 4.7784949999999995 4.7784949999999995 4.7784949999999995 ZT8-11 4.390415 4.390415 4.390415 ZT12-15 7.382695 6.494775 8.270615 ZT16-19 8.36971 8.36971 8.36971 ZT20-23 8.02922 8.02922 8.02922