condition mean min max ZT0-3 10.676471666666666 9.659893333333333 11.69305 ZT4-7 8.53585 8.53585 8.53585 ZT8-11 7.99449 7.99449 7.99449 ZT12-15 9.6695475 7.9214850000000006 11.41761 ZT16-19 12.821625000000001 12.03895 13.6043 ZT20-23 0 0 0