condition mean min max ZT0-3 5.8351025 4.46776 7.202444999999999 ZT4-7 3.868125 3.868125 3.868125 ZT8-11 6.3161950000000004 6.3161950000000004 6.3161950000000004 ZT12-15 0 0 0 ZT16-19 13.376000000000001 13.376000000000001 13.376000000000001 ZT20-23 8.2257 8.2257 8.2257