condition mean min max ZT0-3 10.147903 10.147903 10.147903 ZT4-7 10.804398500000001 10.804398500000001 10.804398500000001 ZT8-11 11.157520000000002 11.157520000000002 11.157520000000002 ZT12-15 9.970012 9.970012 9.970012 ZT16-19 10.1273675 10.1273675 10.1273675 ZT20-23 10.872124 10.872124 10.872124