condition mean min max ZT0-3 14.064421666666666 12.144265 15.076249999999998 ZT4-7 7.711185 7.711185 7.711185 ZT8-11 0.0 0.0 0.0 ZT12-15 2.956 0.0 5.912 ZT16-19 2.86404 2.86404 2.86404 ZT20-23 0.0 0.0 0.0