condition mean min max ZT0-3 0.039756875 0.03949475 0.040019 ZT4-7 0.01971065 0.01971065 0.01971065 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.0393463 0.0393463 0.0393463 ZT20-23 0.03954455 0.03954455 0.03954455