condition mean min max ZT0-3 26.73205 26.73205 26.73205 ZT4-7 18.9361 18.9361 18.9361 ZT8-11 11.80835 11.80835 11.80835 ZT12-15 12.94915 12.94915 12.94915 ZT16-19 19.15755 19.15755 19.15755 ZT20-23 22.426000000000002 22.426000000000002 22.426000000000002