condition mean min max ZT0-3 57.931798 57.931798 57.931798 ZT4-7 38.004759 38.004759 38.004759 ZT8-11 32.8786645 32.8786645 32.8786645 ZT12-15 44.570862 44.570862 44.570862 ZT16-19 36.574104500000004 36.574104500000004 36.574104500000004 ZT20-23 28.4658005 28.4658005 28.4658005