condition mean min max ZT0-3 2.733030578 2.692019615 2.7740415410000003 ZT4-7 2.5748772662499997 2.4671062005 2.682648332 ZT8-11 2.70496558275 2.4034800675000003 3.006451098 ZT12-15 7.159896814250001 5.491152570000001 8.8286410585 ZT16-19 8.064629386750001 7.545321897 8.583936876500001 ZT20-23 9.61167734175 9.159727209 10.063627474499999