condition mean min max ZT0-3 28.99831 28.99831 28.99831 ZT4-7 84.2934675 84.2934675 84.2934675 ZT8-11 73.1623535 73.1623535 73.1623535 ZT12-15 57.1350185 57.1350185 57.1350185 ZT16-19 55.1329825 55.1329825 55.1329825 ZT20-23 43.9303255 43.9303255 43.9303255