condition mean min max ZT0-3 11.999025 10.622499999999999 13.37555 ZT4-7 11.8539 11.8539 11.8539 ZT8-11 7.3914349999999995 7.3914349999999995 7.3914349999999995 ZT12-15 0 0 0 ZT16-19 12.6332 12.6332 12.6332 ZT20-23 12.09955 12.09955 12.09955