condition mean min max ZT0-3 0.989255 0.981274 0.997236 ZT4-7 0.883016 0.883016 0.883016 ZT8-11 1.99777 1.99777 1.99777 ZT12-15 0 0 0 ZT16-19 2.070605 2.070605 2.070605 ZT20-23 1.96901 1.96901 1.96901