condition mean min max ZT0-3 4.767390000000001 4.757005 4.777775 ZT4-7 2.618835 2.618835 2.618835 ZT8-11 2.56007 2.56007 2.56007 ZT12-15 0 0 0 ZT16-19 4.34407 4.34407 4.34407 ZT20-23 4.1736699999999995 4.1736699999999995 4.1736699999999995