condition mean min max ZT0-3 34.0602 29.18485 38.93555 ZT4-7 20.87595 20.87595 20.87595 ZT8-11 13.3964 13.3964 13.3964 ZT12-15 0 0 0 ZT16-19 17.55245 17.55245 17.55245 ZT20-23 24.85915 24.85915 24.85915