condition mean min max ZT0-3 584.7 584.7 584.7 ZT4-7 661.4 661.4 661.4 ZT8-11 548.0 548.0 548.0 ZT12-15 313.1 313.1 313.1 ZT16-19 238.89999999999998 238.89999999999998 238.89999999999998 ZT20-23 515.3 515.3 515.3