condition mean min max ZT0-3 6.57222 5.557775 7.88996 ZT4-7 1.5185775 1.5185775 1.5185775 ZT8-11 1.3421699999999999 1.3421699999999999 1.3421699999999999 ZT12-15 4.3874175 3.4437550000000003 5.33108 ZT16-19 2.853515 2.853515 2.853515 ZT20-23 5.880635 5.880635 5.880635