condition mean min max ZT0-3 0.216559 0.0976055 0.2807715 ZT4-7 0.088335 0.088335 0.088335 ZT8-11 32.2433 32.2433 32.2433 ZT12-15 81.68775 36.8645 126.511 ZT16-19 7.755495 7.755495 7.755495 ZT20-23 1.246805 1.246805 1.246805