condition mean min max ZT0-3 208.29483333333334 165.498 249.337 ZT4-7 140.659 140.659 140.659 ZT8-11 133.9885 133.9885 133.9885 ZT12-15 250.94099999999997 220.198 281.68399999999997 ZT16-19 322.1725 322.1725 322.1725 ZT20-23 317.1245 317.1245 317.1245