condition mean min max ZT0-3 1.5623150000000001 1.4855200000000002 1.63911 ZT4-7 2.60993 2.60993 2.60993 ZT8-11 7.387575 7.387575 7.387575 ZT12-15 0 0 0 ZT16-19 7.001614999999999 7.001614999999999 7.001614999999999 ZT20-23 4.192735000000001 4.192735000000001 4.192735000000001