condition mean min max ZT0-3 1.2458495 1.2458495 1.2458495 ZT4-7 0.7526635 0.7526635 0.7526635 ZT8-11 0.47188450000000004 0.47188450000000004 0.47188450000000004 ZT12-15 1.6829345 1.6829345 1.6829345 ZT16-19 2.12119 2.12119 2.12119 ZT20-23 1.828225 1.828225 1.828225