condition mean min max ZT0-3 14.45 14.45 14.45 ZT4-7 3.1 3.1 3.1 ZT8-11 8.7 8.7 8.7 ZT12-15 8.0 8.0 8.0 ZT16-19 2.9 2.9 2.9 ZT20-23 7.050000000000001 7.050000000000001 7.050000000000001