condition mean min max ZT0-3 187.727378 187.727378 187.727378 ZT4-7 166.81451750000002 166.81451750000002 166.81451750000002 ZT8-11 126.35652999999999 126.35652999999999 126.35652999999999 ZT12-15 165.5767955 165.5767955 165.5767955 ZT16-19 115.7833435 115.7833435 115.7833435 ZT20-23 105.870821 105.870821 105.870821