condition mean min max ZT0-3 2.9000000000000004 2.9000000000000004 2.9000000000000004 ZT4-7 2.7 2.7 2.7 ZT8-11 5.95 5.95 5.95 ZT12-15 9.1 9.1 9.1 ZT16-19 6.1 6.1 6.1 ZT20-23 5.1 5.1 5.1