condition mean min max ZT0-3 32.021337 32.021337 32.021337 ZT4-7 33.2110185 33.2110185 33.2110185 ZT8-11 31.251865 31.251865 31.251865 ZT12-15 32.8464325 32.8464325 32.8464325 ZT16-19 47.726672 47.726672 47.726672 ZT20-23 53.539741500000005 53.539741500000005 53.539741500000005