condition mean min max ZT0-3 33.658 16.6348 43.1578 ZT4-7 13.199300000000001 13.199300000000001 13.199300000000001 ZT8-11 12.030149999999999 12.030149999999999 12.030149999999999 ZT12-15 22.111875 19.884300000000003 24.33945 ZT16-19 28.14025 28.14025 28.14025 ZT20-23 42.72905 42.72905 42.72905