condition mean min max ZT0-3 7.0 7.0 7.0 ZT4-7 7.0 7.0 7.0 ZT8-11 23.0 23.0 23.0 ZT12-15 4.300000000000001 4.300000000000001 4.300000000000001 ZT16-19 5.95 5.95 5.95 ZT20-23 7.3500000000000005 7.3500000000000005 7.3500000000000005