condition mean min max ZT0-3 14.68615677 11.35031894 18.0219946 ZT4-7 73.27110809000001 48.889582555000004 97.652633625 ZT8-11 72.11516590000001 66.91328787 77.31704393000001 ZT12-15 52.60572219 47.76181672 57.449627660000004 ZT16-19 60.5370481425 52.6723766 68.401719685 ZT20-23 75.58273106000001 70.81389839 80.35156373000001