condition mean min max ZT0-3 1279.1 1279.1 1279.1 ZT4-7 2270.2 2270.2 2270.2 ZT8-11 2556.6000000000004 2556.6000000000004 2556.6000000000004 ZT12-15 2272.1000000000004 2272.1000000000004 2272.1000000000004 ZT16-19 1921.3000000000002 1921.3000000000002 1921.3000000000002 ZT20-23 1541.05 1541.05 1541.05