condition mean min max ZT0-3 893.3 893.3 893.3 ZT4-7 1121.5 1121.5 1121.5 ZT8-11 1041.85 1041.85 1041.85 ZT12-15 817.7 817.7 817.7 ZT16-19 931.8499999999999 931.8499999999999 931.8499999999999 ZT20-23 690.1 690.1 690.1