condition mean min max ZT0-3 1.8515675430000003 1.714215414 1.9889196720000002 ZT4-7 2.1383014275 1.554276525 2.72232633 ZT8-11 5.518232671 3.791481168 7.244984174000001 ZT12-15 6.64545762875 6.220836401000001 7.0700788564999995 ZT16-19 2.5984538665 2.5110416095 2.6858661235 ZT20-23 3.58734405125 3.130730584 4.0439575185