condition mean min max ZT0-3 13.10818 8.276440000000001 22.004350000000002 ZT4-7 10.03542 10.03542 10.03542 ZT8-11 75.59585 75.59585 75.59585 ZT12-15 99.863125 77.52775 122.1985 ZT16-19 48.868950000000005 48.868950000000005 48.868950000000005 ZT20-23 38.784400000000005 38.784400000000005 38.784400000000005