condition mean min max ZT0-3 84.36260828333334 82.57928636666666 86.14593020000001 ZT4-7 75.624145085 73.87892031 77.36936985999999 ZT8-11 78.36642530166668 75.71697101000001 81.01587959333334 ZT12-15 80.21444654166666 75.39135722333333 85.03753586 ZT16-19 77.91837803499999 75.23510717666666 80.60164889333333 ZT20-23 86.16499881833334 84.74354207 87.58645556666667