condition mean min max ZT0-3 1.0987230000000001 1.0987230000000001 1.0987230000000001 ZT4-7 0.9791295 0.9791295 0.9791295 ZT8-11 1.629685 1.629685 1.629685 ZT12-15 1.9552649999999998 1.9552649999999998 1.9552649999999998 ZT16-19 2.9770950000000003 2.9770950000000003 2.9770950000000003 ZT20-23 1.0521945000000001 1.0521945000000001 1.0521945000000001