condition mean min max ZT0-3 0.3566623333333333 0.1590245 0.46701499999999996 ZT4-7 0.0 0.0 0.0 ZT8-11 0.304532 0.304532 0.304532 ZT12-15 1.011777 0.633967 1.3895870000000001 ZT16-19 0.7152585 0.7152585 0.7152585 ZT20-23 1.311442 1.311442 1.311442