condition mean min max ZT0-3 12.50703195725 10.3985037245 14.61556019 ZT4-7 5.0523602375 4.423878622 5.680841853 ZT8-11 10.284774085999999 8.463563112 12.10598506 ZT12-15 9.3810472945 8.9510371505 9.8110574385 ZT16-19 6.561330366 5.81950609 7.303154642 ZT20-23 6.7219775854999995 5.456841627 7.987113544