condition mean min max ZT0-3 1.2 1.2 1.2 ZT4-7 3.2 3.2 3.2 ZT8-11 16.0 16.0 16.0 ZT12-15 17.15 17.15 17.15 ZT16-19 8.9 8.9 8.9 ZT20-23 7.300000000000001 7.300000000000001 7.300000000000001