condition mean min max ZT0-3 6.181755 6.17723 6.18628 ZT4-7 7.214835 7.214835 7.214835 ZT8-11 5.843795 5.843795 5.843795 ZT12-15 0 0 0 ZT16-19 9.624274999999999 9.624274999999999 9.624274999999999 ZT20-23 7.940525000000001 7.940525000000001 7.940525000000001