condition mean min max ZT0-3 6.199999999999999 6.199999999999999 6.199999999999999 ZT4-7 2.2 2.2 2.2 ZT8-11 8.100000000000001 8.100000000000001 8.100000000000001 ZT12-15 5.85 5.85 5.85 ZT16-19 5.25 5.25 5.25 ZT20-23 6.15 6.15 6.15