condition mean min max ZT0-3 15.620875 12.6294 18.61235 ZT4-7 13.680250000000001 13.680250000000001 13.680250000000001 ZT8-11 9.868915 9.868915 9.868915 ZT12-15 0 0 0 ZT16-19 11.96145 11.96145 11.96145 ZT20-23 21.24275 21.24275 21.24275