condition mean min max ZT0-3 63.7687023625 60.66175602 66.875648705 ZT4-7 44.194834265000004 41.87700017 46.512668360000006 ZT8-11 26.5144136725 22.75835817 30.270469175000002 ZT12-15 68.435156885 50.500528965 86.369784805 ZT16-19 120.474655025 112.74234525 128.2069648 ZT20-23 213.226808125 185.19338019999998 241.26023605