condition mean min max ZT0-3 583.069369 583.069369 583.069369 ZT4-7 640.6328080000001 640.6328080000001 640.6328080000001 ZT8-11 896.7577550000001 896.7577550000001 896.7577550000001 ZT12-15 858.6287305000001 858.6287305000001 858.6287305000001 ZT16-19 1066.54005 1066.54005 1066.54005 ZT20-23 865.117965 865.117965 865.117965