condition mean min max ZT0-3 1.8579100000000002 1.51303 2.2027900000000002 ZT4-7 1.9761 1.9761 1.9761 ZT8-11 2.539775 2.539775 2.539775 ZT12-15 0 0 0 ZT16-19 3.14874 3.14874 3.14874 ZT20-23 4.058445 4.058445 4.058445