condition mean min max ZT0-3 246.94372192499998 215.93460964999997 277.9528342 ZT4-7 156.076986475 143.91243975000003 168.2415332 ZT8-11 154.34822435 150.7800507 157.91639800000002 ZT12-15 147.216634125 133.71334085 160.71992740000002 ZT16-19 208.7337978 177.8351809 239.63241469999997 ZT20-23 277.698477125 274.2347479 281.16220635