condition mean min max ZT0-3 112.872272 112.872272 112.872272 ZT4-7 75.91510249999999 75.91510249999999 75.91510249999999 ZT8-11 96.999745 96.999745 96.999745 ZT12-15 99.27538799999999 99.27538799999999 99.27538799999999 ZT16-19 227.01171200000002 227.01171200000002 227.01171200000002 ZT20-23 259.2946705 259.2946705 259.2946705