condition mean min max ZT0-3 4.88999997875 3.9022652030000002 5.8777347545 ZT4-7 10.855723321500001 7.583728098 14.127718545 ZT8-11 15.7550442525 13.826665485 17.68342302 ZT12-15 7.745291713 5.350423829 10.140159597 ZT16-19 6.91679802925 5.8611628355 7.9724332229999995 ZT20-23 11.213987746250002 9.638656407500001 12.789319085