condition mean min max ZT0-3 29.304949999999998 25.3154 33.2945 ZT4-7 13.5023 13.5023 13.5023 ZT8-11 10.986455 10.986455 10.986455 ZT12-15 0 0 0 ZT16-19 19.560850000000002 19.560850000000002 19.560850000000002 ZT20-23 23.9356 23.9356 23.9356