condition mean min max ZT0-3 0.22771755000000002 0.0 0.5009170000000001 ZT4-7 0.1298112 0.1298112 0.1298112 ZT8-11 0.2666815 0.2666815 0.2666815 ZT12-15 0.6220375 0.3626565 0.8814185 ZT16-19 0.7596160000000001 0.7596160000000001 0.7596160000000001 ZT20-23 0.23716349999999997 0.23716349999999997 0.23716349999999997