condition mean min max ZT0-3 7.1000000000000005 7.1000000000000005 7.1000000000000005 ZT4-7 0.9 0.9 0.9 ZT8-11 9.1 9.1 9.1 ZT12-15 4.3 4.3 4.3 ZT16-19 8.65 8.65 8.65 ZT20-23 2.8 2.8 2.8