condition mean min max ZT0-3 63.248568 63.248568 63.248568 ZT4-7 62.5675015 62.5675015 62.5675015 ZT8-11 58.575119 58.575119 58.575119 ZT12-15 63.538684 63.538684 63.538684 ZT16-19 60.0604745 60.0604745 60.0604745 ZT20-23 63.6477335 63.6477335 63.6477335