condition mean min max ZT0-3 7342.049999999999 7342.049999999999 7342.049999999999 ZT4-7 118.4 118.4 118.4 ZT8-11 145.3 145.3 145.3 ZT12-15 367.65000000000003 367.65000000000003 367.65000000000003 ZT16-19 1934.1999999999998 1934.1999999999998 1934.1999999999998 ZT20-23 6032.0 6032.0 6032.0