condition mean min max ZT0-3 22.793422 22.793422 22.793422 ZT4-7 70.1218535 70.1218535 70.1218535 ZT8-11 70.4344425 70.4344425 70.4344425 ZT12-15 42.930381499999996 42.930381499999996 42.930381499999996 ZT16-19 34.518539000000004 34.518539000000004 34.518539000000004 ZT20-23 31.831081500000003 31.831081500000003 31.831081500000003