condition mean min max ZT0-3 19.307000000000002 19.307000000000002 19.307000000000002 ZT4-7 15.47905 15.47905 15.47905 ZT8-11 16.2895 16.2895 16.2895 ZT12-15 17.0955 17.0955 17.0955 ZT16-19 22.948549999999997 22.948549999999997 22.948549999999997 ZT20-23 20.88025 20.88025 20.88025