condition mean min max ZT0-3 7.535310000000001 7.535310000000001 7.535310000000001 ZT4-7 6.666790000000001 6.666790000000001 6.666790000000001 ZT8-11 5.784105 5.784105 5.784105 ZT12-15 7.287240000000001 7.287240000000001 7.287240000000001 ZT16-19 9.43886 9.43886 9.43886 ZT20-23 9.588586666666666 9.588586666666666 9.588586666666666