condition mean min max ZT0-3 51.005680865 50.09133903 51.920022700000004 ZT4-7 55.2460485925 44.46377998 66.02831720500001 ZT8-11 102.7595501175 80.249997135 125.2691031 ZT12-15 54.84335792 26.45263868 83.23407716 ZT16-19 13.314314127500001 12.061274125 14.56735413 ZT20-23 8.185915236749999 6.423028392999999 9.9488020805