condition mean min max ZT0-3 1567.4 1567.4 1567.4 ZT4-7 1245.5 1245.5 1245.5 ZT8-11 1317.65 1317.65 1317.65 ZT12-15 1249.25 1249.25 1249.25 ZT16-19 1340.5500000000002 1340.5500000000002 1340.5500000000002 ZT20-23 1563.15 1563.15 1563.15