condition mean min max ZT0-3 13.977527499999999 11.450205 16.504849999999998 ZT4-7 7.20494 7.20494 7.20494 ZT8-11 5.44567 5.44567 5.44567 ZT12-15 0 0 0 ZT16-19 10.274615 10.274615 10.274615 ZT20-23 13.36105 13.36105 13.36105