condition mean min max ZT0-3 1.8616888757500003 0.9144219000000001 2.8089558515000004 ZT4-7 9.0266870615 6.590531413 11.46284271 ZT8-11 25.88348902 21.96455007 29.80242797 ZT12-15 27.356683009999998 22.638738314999998 32.074627705 ZT16-19 20.95608078 20.471821990000002 21.44033957 ZT20-23 27.652867415 21.99522563 33.3105092