condition mean min max ZT0-3 3.68072 2.642435 4.719005 ZT4-7 6.93107 6.93107 6.93107 ZT8-11 14.07389 14.07389 14.07389 ZT12-15 0 0 0 ZT16-19 6.44249 6.44249 6.44249 ZT20-23 4.389805 4.389805 4.389805