condition mean min max ZT0-3 0.04675113333333333 0.0291356 0.07085545 ZT4-7 0.0485574 0.0485574 0.0485574 ZT8-11 0.08002000000000001 0.08002000000000001 0.08002000000000001 ZT12-15 0.027450950000000002 0.021703 0.0331989 ZT16-19 0.04764635 0.04764635 0.04764635 ZT20-23 0.04283965 0.04283965 0.04283965