condition mean min max ZT0-3 9.1623175 9.061595 9.26304 ZT4-7 2.36558 2.36558 2.36558 ZT8-11 3.49596 3.49596 3.49596 ZT12-15 0 0 0 ZT16-19 13.88415 13.88415 13.88415 ZT20-23 6.608169999999999 6.608169999999999 6.608169999999999