condition mean min max ZT0-3 46.923161965000006 42.62729719000001 51.21902674 ZT4-7 67.91888140333333 66.87489011 68.96287269666666 ZT8-11 58.961969205 58.39037531 59.5335631 ZT12-15 68.28199292 63.51312633 73.05085951 ZT16-19 83.38999826333334 81.07293055000001 85.70706597666667 ZT20-23 72.610142505 68.3118183 76.90846671