condition mean min max ZT0-3 4.85008 4.8308 4.86936 ZT4-7 2.78485 2.78485 2.78485 ZT8-11 2.834745 2.834745 2.834745 ZT12-15 0 0 0 ZT16-19 3.011125 3.011125 3.011125 ZT20-23 3.66777 3.66777 3.66777