condition mean min max ZT0-3 18.05 18.05 18.05 ZT4-7 4.4 4.4 4.4 ZT8-11 3.7 3.7 3.7 ZT12-15 13.600000000000001 13.600000000000001 13.600000000000001 ZT16-19 28.25 28.25 28.25 ZT20-23 11.600000000000001 11.600000000000001 11.600000000000001