condition mean min max ZT0-3 0.8067709295000001 0.7048434490000001 0.90869841 ZT4-7 1.8247246887500002 1.237673108 2.4117762695000002 ZT8-11 6.086426395749999 4.180490349 7.992362442499999 ZT12-15 7.7875351017500005 7.078057464 8.4970127395 ZT16-19 4.54716464725 4.0966416489999995 4.9976876455 ZT20-23 3.840780778 3.6510733595 4.0304881965