condition mean min max ZT0-3 2267.00631575 1771.0750935 2762.9375379999997 ZT4-7 973.6324571250001 911.0028553500001 1036.2620589 ZT8-11 1125.615387175 977.83504085 1273.3957335 ZT12-15 1295.85163875 1225.697593 1366.0056845 ZT16-19 1084.785209575 951.14709315 1218.423326 ZT20-23 599.6978755 493.99083915000006 705.40491185