condition mean min max ZT0-3 5.68851 5.5475449999999995 5.829475 ZT4-7 8.9363 8.9363 8.9363 ZT8-11 13.29115 13.29115 13.29115 ZT12-15 0 0 0 ZT16-19 9.838525 9.838525 9.838525 ZT20-23 9.12621 9.12621 9.12621