condition mean min max ZT0-3 52.5253590675 48.429133504999996 56.62158463 ZT4-7 35.2199240825 31.962344505 38.477503659999996 ZT8-11 31.98957188 29.55443395 34.42470981 ZT12-15 16.80007010275 15.191957565 18.4081826405 ZT16-19 26.9109252775 22.037067155 31.7847834 ZT20-23 36.8776692175 34.268954265 39.48638417