condition mean min max ZT0-3 1.69593908975 1.5820059869999998 1.8098721925 ZT4-7 2.62733250525 1.8535019080000001 3.4011631025 ZT8-11 11.47176896025 7.8468194355000005 15.096718485 ZT12-15 12.93926997675 11.815406469 14.0631334845 ZT16-19 4.973999266 4.6448713665 5.3031271655 ZT20-23 4.19831373575 4.0972807245 4.2993467469999995