condition mean min max ZT0-3 66.13861666666666 47.74105 81.32634999999999 ZT4-7 44.8775 44.8775 44.8775 ZT8-11 34.417950000000005 34.417950000000005 34.417950000000005 ZT12-15 56.806775 55.4644 58.149150000000006 ZT16-19 59.66145 59.66145 59.66145 ZT20-23 83.563 83.563 83.563