condition mean min max ZT0-3 0.30571950000000003 0.204117 0.407322 ZT4-7 0.4155895 0.4155895 0.4155895 ZT8-11 0.7119985 0.7119985 0.7119985 ZT12-15 0 0 0 ZT16-19 0.3012265 0.3012265 0.3012265 ZT20-23 0.6067855 0.6067855 0.6067855