condition mean min max ZT0-3 21.118983333333333 20.258899999999997 22.59315 ZT4-7 19.7942 19.7942 19.7942 ZT8-11 13.166799999999999 13.166799999999999 13.166799999999999 ZT12-15 16.966925 15.37045 18.5634 ZT16-19 15.2401 15.2401 15.2401 ZT20-23 21.193550000000002 21.193550000000002 21.193550000000002