condition mean min max ZT0-3 0.062448437499999995 0.047626416 0.077270459 ZT4-7 0.01932380225 0.017131081 0.021516523500000002 ZT8-11 0.0054426069999999995 0.0 0.010885213999999999 ZT12-15 0.0237253115 0.018599689 0.028850933999999998 ZT16-19 0.0686556135 0.0402300735 0.0970811535 ZT20-23 0.074376986 0.0470935955 0.1016603765