condition mean min max ZT0-3 12.311 12.311 12.311 ZT4-7 10.5478 10.5478 10.5478 ZT8-11 10.6865 10.6865 10.6865 ZT12-15 12.43205 12.43205 12.43205 ZT16-19 11.9441 11.9441 11.9441 ZT20-23 11.5687 11.5687 11.5687