condition mean min max ZT0-3 48.628225 48.628225 48.628225 ZT4-7 58.723549 58.723549 58.723549 ZT8-11 58.636925000000005 58.636925000000005 58.636925000000005 ZT12-15 60.527342 60.527342 60.527342 ZT16-19 58.70837 58.70837 58.70837 ZT20-23 50.4902655 50.4902655 50.4902655