condition mean min max ZT0-3 28.135125000000002 27.05865 29.2116 ZT4-7 25.77225 25.77225 25.77225 ZT8-11 18.9279 18.9279 18.9279 ZT12-15 0 0 0 ZT16-19 27.51345 27.51345 27.51345 ZT20-23 33.7744 33.7744 33.7744