condition mean min max ZT0-3 11.072700457749999 9.7795730755 12.36582784 ZT4-7 3.8846211947500002 3.5149553625000003 4.254287027 ZT8-11 11.97242858425 8.0325193385 15.91233783 ZT12-15 17.2185498125 17.03784742 17.399252205 ZT16-19 15.8869797675 14.891484349999999 16.882475185 ZT20-23 14.155802285 11.668459604999999 16.643144965