condition mean min max ZT0-3 4.200095 4.200095 4.200095 ZT4-7 3.657785 3.657785 3.657785 ZT8-11 3.77363 3.77363 3.77363 ZT12-15 4.980195 4.980195 4.980195 ZT16-19 5.273685 5.273685 5.273685 ZT20-23 4.5598399999999994 4.5598399999999994 4.5598399999999994