condition mean min max ZT0-3 832.689029 832.689029 832.689029 ZT4-7 604.307819 604.307819 604.307819 ZT8-11 729.6380105000001 729.6380105000001 729.6380105000001 ZT12-15 869.9255390000001 869.9255390000001 869.9255390000001 ZT16-19 935.81797 935.81797 935.81797 ZT20-23 776.3961995 776.3961995 776.3961995