condition mean min max ZT0-3 3.27838 2.87804 3.865245 ZT4-7 2.953515 2.953515 2.953515 ZT8-11 3.82111 3.82111 3.82111 ZT12-15 6.873912499999999 6.51894 7.228885 ZT16-19 5.81115 5.81115 5.81115 ZT20-23 4.907615 4.907615 4.907615