condition mean min max ZT0-3 10.686475 10.686475 10.686475 ZT4-7 9.344087 9.344087 9.344087 ZT8-11 9.359335 9.359335 9.359335 ZT12-15 10.1799175 10.1799175 10.1799175 ZT16-19 9.407971499999999 9.407971499999999 9.407971499999999 ZT20-23 10.581285000000001 10.581285000000001 10.581285000000001