condition mean min max ZT0-3 24.5 24.5 24.5 ZT4-7 3.7 3.7 3.7 ZT8-11 3.6500000000000004 3.6500000000000004 3.6500000000000004 ZT12-15 8.4 8.4 8.4 ZT16-19 3.3000000000000003 3.3000000000000003 3.3000000000000003 ZT20-23 3.4 3.4 3.4