condition mean min max ZT0-3 7.0596175 6.765555 7.353680000000001 ZT4-7 12.7365 12.7365 12.7365 ZT8-11 16.2758 16.2758 16.2758 ZT12-15 0 0 0 ZT16-19 14.533850000000001 14.533850000000001 14.533850000000001 ZT20-23 11.142900000000001 11.142900000000001 11.142900000000001