condition mean min max ZT0-3 1337.297972 1337.297972 1337.297972 ZT4-7 1876.8826569999999 1876.8826569999999 1876.8826569999999 ZT8-11 2375.1341135000002 2375.1341135000002 2375.1341135000002 ZT12-15 2241.710185 2241.710185 2241.710185 ZT16-19 1724.526983 1724.526983 1724.526983 ZT20-23 1939.6046255 1939.6046255 1939.6046255