condition mean min max ZT0-3 47.0634 35.06315 59.063649999999996 ZT4-7 35.765699999999995 35.765699999999995 35.765699999999995 ZT8-11 33.549499999999995 33.549499999999995 33.549499999999995 ZT12-15 0 0 0 ZT16-19 59.23805 59.23805 59.23805 ZT20-23 47.6404 47.6404 47.6404