condition mean min max ZT0-3 1965.078211 1965.078211 1965.078211 ZT4-7 1793.519389 1793.519389 1793.519389 ZT8-11 1939.802941 1939.802941 1939.802941 ZT12-15 1884.7786955000001 1884.7786955000001 1884.7786955000001 ZT16-19 2329.041347 2329.041347 2329.041347 ZT20-23 2262.9815095 2262.9815095 2262.9815095