condition mean min max ZT0-3 0.45094275 0.42766000000000004 0.47422549999999997 ZT4-7 1.1937235 1.1937235 1.1937235 ZT8-11 1.3058200000000002 1.3058200000000002 1.3058200000000002 ZT12-15 0 0 0 ZT16-19 1.398095 1.398095 1.398095 ZT20-23 1.054365 1.054365 1.054365