condition mean min max ZT0-3 8.3701975 6.274509999999999 10.465885 ZT4-7 7.308154999999999 7.308154999999999 7.308154999999999 ZT8-11 14.10825 14.10825 14.10825 ZT12-15 0 0 0 ZT16-19 15.3593 15.3593 15.3593 ZT20-23 12.88675 12.88675 12.88675