condition mean min max ZT0-3 0.20968466666666666 0.0754135 0.3112965 ZT4-7 0.281943 0.281943 0.281943 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 0.0 0.0 0.0