condition mean min max ZT0-3 37.882395895 31.16013213 44.604659659999996 ZT4-7 134.5209133525 98.404505905 170.6373208 ZT8-11 342.550823775 308.715623 376.38602455 ZT12-15 552.014653425 492.04439060000004 611.98491625 ZT16-19 263.267885 226.3145119 300.2212581 ZT20-23 160.6914549675 136.829973785 184.55293615