condition mean min max ZT0-3 21.9735786475 19.72899832 24.218158975 ZT4-7 21.700385415 18.208540550000002 25.19223028 ZT8-11 27.940491950000002 23.17938449 32.70159941 ZT12-15 22.5545459975 15.661496605 29.44759539 ZT16-19 16.992902989999997 16.61324104 17.37256494 ZT20-23 19.759707347499997 18.330372099999998 21.189042595