condition mean min max ZT0-3 37.9495 33.51755 42.38145 ZT4-7 16.6804 16.6804 16.6804 ZT8-11 14.43515 14.43515 14.43515 ZT12-15 0 0 0 ZT16-19 18.9766 18.9766 18.9766 ZT20-23 32.25695 32.25695 32.25695