condition mean min max ZT0-3 10.027885000000001 8.24637 11.8094 ZT4-7 6.76899 6.76899 6.76899 ZT8-11 1.911005 1.911005 1.911005 ZT12-15 0 0 0 ZT16-19 2.545355 2.545355 2.545355 ZT20-23 8.787980000000001 8.787980000000001 8.787980000000001