condition mean min max ZT0-3 0.046971 0.046971 0.046971 ZT4-7 0.041586 0.041586 0.041586 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0156693 0.0156693 0.0156693