condition mean min max ZT0-3 49.30818 49.30818 49.30818 ZT4-7 50.9272215 50.9272215 50.9272215 ZT8-11 58.2566705 58.2566705 58.2566705 ZT12-15 62.0008845 62.0008845 62.0008845 ZT16-19 66.981419 66.981419 66.981419 ZT20-23 68.5762695 68.5762695 68.5762695