condition mean min max ZT0-3 84.1507832325 76.67457276 91.626993705 ZT4-7 80.23657656 78.56646709333333 81.90668602666666 ZT8-11 86.03938919666666 81.48006491333334 90.59871348 ZT12-15 73.25562409666666 71.60830373333333 74.90294446 ZT16-19 71.61378213166667 66.46938216 76.75818210333334 ZT20-23 68.32451203 65.51639374 71.13263032