condition mean min max ZT0-3 55.01356666666667 50.15905 60.01115 ZT4-7 45.62645 45.62645 45.62645 ZT8-11 30.4128 30.4128 30.4128 ZT12-15 32.581575 31.728749999999998 33.4344 ZT16-19 28.4223 28.4223 28.4223 ZT20-23 43.1135 43.1135 43.1135