condition mean min max ZT0-3 1694.4 1694.4 1694.4 ZT4-7 1160.2 1160.2 1160.2 ZT8-11 864.5999999999999 864.5999999999999 864.5999999999999 ZT12-15 773.9000000000001 773.9000000000001 773.9000000000001 ZT16-19 712.1 712.1 712.1 ZT20-23 926.8499999999999 926.8499999999999 926.8499999999999