condition mean min max ZT0-3 10.1 10.1 10.1 ZT4-7 8.6 8.6 8.6 ZT8-11 24.0 24.0 24.0 ZT12-15 8.3 8.3 8.3 ZT16-19 3.45 3.45 3.45 ZT20-23 3.6500000000000004 3.6500000000000004 3.6500000000000004