condition mean min max ZT0-3 6.51834 6.007770000000001 7.02891 ZT4-7 5.814170000000001 5.814170000000001 5.814170000000001 ZT8-11 16.6068 16.6068 16.6068 ZT12-15 0 0 0 ZT16-19 13.8015 13.8015 13.8015 ZT20-23 9.934295 9.934295 9.934295