condition mean min max ZT0-3 1.4825233333333334 1.37569 1.652595 ZT4-7 0.4471097772 0.4471097772 0.4471097772 ZT8-11 0.6238275705 0.6238275705 0.6238275705 ZT12-15 2.274115 2.2254050000000003 2.322825 ZT16-19 2.838565 2.838565 2.838565 ZT20-23 2.652375 2.652375 2.652375