condition mean min max ZT0-3 50.879125 45.9587 55.799549999999996 ZT4-7 29.8964 29.8964 29.8964 ZT8-11 29.7427 29.7427 29.7427 ZT12-15 0 0 0 ZT16-19 44.53505 44.53505 44.53505 ZT20-23 47.9821 47.9821 47.9821