condition mean min max ZT0-3 10.336235725999998 9.790393472 10.882077979999998 ZT4-7 12.851069517500001 10.42612157 15.276017465 ZT8-11 32.78226488 20.23754984 45.32697992 ZT12-15 54.0958122925 53.5504617 54.641162885 ZT16-19 48.2398314625 47.898480629999995 48.581182295000005 ZT20-23 41.429624297500006 40.581937765000006 42.277310830000005