condition mean min max ZT0-3 81.568949 81.568949 81.568949 ZT4-7 79.1474965 79.1474965 79.1474965 ZT8-11 70.6796215 70.6796215 70.6796215 ZT12-15 76.3312895 76.3312895 76.3312895 ZT16-19 135.898996 135.898996 135.898996 ZT20-23 133.67225100000002 133.67225100000002 133.67225100000002