condition mean min max ZT0-3 347.3 347.3 347.3 ZT4-7 278.5 278.5 278.5 ZT8-11 241.1 241.1 241.1 ZT12-15 113.45 113.45 113.45 ZT16-19 78.80000000000001 78.80000000000001 78.80000000000001 ZT20-23 175.3 175.3 175.3