condition mean min max ZT0-3 1.669369 0.447347 2.81463 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 2.1329225 1.989645 2.2762 ZT16-19 0.83764 0.83764 0.83764 ZT20-23 0.4901275 0.4901275 0.4901275