condition mean min max ZT0-3 44.909075 42.012950000000004 47.8052 ZT4-7 14.8899 14.8899 14.8899 ZT8-11 9.860045 9.860045 9.860045 ZT12-15 0 0 0 ZT16-19 13.61243 13.61243 13.61243 ZT20-23 27.7879 27.7879 27.7879