condition mean min max ZT0-3 39.41265 35.46625 42.90065 ZT4-7 38.06445 38.06445 38.06445 ZT8-11 25.608649999999997 25.608649999999997 25.608649999999997 ZT12-15 39.1448 37.940349999999995 40.34925 ZT16-19 33.375550000000004 33.375550000000004 33.375550000000004 ZT20-23 41.418400000000005 41.418400000000005 41.418400000000005