condition mean min max ZT0-3 0.40449652024999994 0.20452286749999998 0.6044701729999999 ZT4-7 0.1416936385 0.051790502 0.231596775 ZT8-11 1.09330684 0.4145225175 1.7720911624999998 ZT12-15 2.786998999 2.5413417745 3.0326562235 ZT16-19 1.5968377215 1.423130644 1.770544799 ZT20-23 1.08391990125 0.9290363455 1.238803457