condition mean min max ZT0-3 16.0977188875 15.95895216 16.236485615 ZT4-7 5.5994795342499994 5.157373489499999 6.041585579 ZT8-11 4.39565170675 4.1386541445 4.652649268999999 ZT12-15 4.58890882325 4.3442992615 4.833518385 ZT16-19 5.488786509500001 5.3456034265 5.6319695925 ZT20-23 4.5109216275 3.506437498 5.515405757