condition mean min max ZT0-3 2575.65 2575.65 2575.65 ZT4-7 3372.5 3372.5 3372.5 ZT8-11 2767.8 2767.8 2767.8 ZT12-15 2946.8999999999996 2946.8999999999996 2946.8999999999996 ZT16-19 2683.8500000000004 2683.8500000000004 2683.8500000000004 ZT20-23 2708.15 2708.15 2708.15