condition mean min max ZT0-3 0.166490348 0.0 0.332980696 ZT4-7 0.93047885225 0.29274967949999997 1.5682080250000001 ZT8-11 2.999400768 2.1299141915 3.8688873445 ZT12-15 4.3146569795000005 4.075899849000001 4.55341411 ZT16-19 4.147125495999999 3.227946555 5.066304436999999 ZT20-23 3.0258862075 2.863275868 3.188496547