condition mean min max ZT0-3 0.3221679833333333 0.19892695 0.487224 ZT4-7 0.2336315 0.2336315 0.2336315 ZT8-11 0.678992 0.678992 0.678992 ZT12-15 6.56226 1.823635 11.300885000000001 ZT16-19 2.22235 2.22235 2.22235 ZT20-23 1.0639955 1.0639955 1.0639955