condition mean min max ZT0-3 9.8285798265 9.183694093 10.47346556 ZT4-7 8.850434689250001 7.1876359835 10.513233395 ZT8-11 7.87227848575 7.42704232 8.3175146515 ZT12-15 3.8891963485000005 2.694690088 5.083702609 ZT16-19 2.8565546387499996 2.327739784 3.3853694935 ZT20-23 4.9755474799999995 4.399602269 5.551492691