condition mean min max ZT0-3 37.71980208 32.3066679 43.13293626 ZT4-7 9.37540988575 7.536640666 11.214179105500001 ZT8-11 4.39981664025 4.3852700745 4.414363206 ZT12-15 3.7621110602499996 3.1420060215 4.382216099 ZT16-19 3.80335328425 3.3839799905 4.222726578 ZT20-23 7.2563847915 6.925594223000001 7.58717536