condition mean min max ZT0-3 3.42966 3.42966 3.42966 ZT4-7 1.169845 1.169845 1.169845 ZT8-11 0.8739844999999999 0.8739844999999999 0.8739844999999999 ZT12-15 18.5774 18.5774 18.5774 ZT16-19 30.9605 30.9605 30.9605 ZT20-23 10.646600000000001 10.646600000000001 10.646600000000001