condition mean min max ZT0-3 3.7991525 3.436025 4.16228 ZT4-7 2.243525 2.243525 2.243525 ZT8-11 1.0294735 1.0294735 1.0294735 ZT12-15 0 0 0 ZT16-19 1.7536049999999999 1.7536049999999999 1.7536049999999999 ZT20-23 2.965385 2.965385 2.965385