condition mean min max ZT0-3 8.0 8.0 8.0 ZT4-7 0.5 0.5 0.5 ZT8-11 1.9000000000000001 1.9000000000000001 1.9000000000000001 ZT12-15 8.2 8.2 8.2 ZT16-19 14.299999999999999 14.299999999999999 14.299999999999999 ZT20-23 14.4 14.4 14.4