condition mean min max ZT0-3 2577.8500000000004 2577.8500000000004 2577.8500000000004 ZT4-7 2263.0 2263.0 2263.0 ZT8-11 2460.25 2460.25 2460.25 ZT12-15 2925.1499999999996 2925.1499999999996 2925.1499999999996 ZT16-19 2655.0 2655.0 2655.0 ZT20-23 2245.3500000000004 2245.3500000000004 2245.3500000000004