condition mean min max ZT0-3 0.01803495 0.01803495 0.01803495 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0278871 0.0278871 0.0278871 ZT12-15 0.0414714 0.0414714 0.0414714 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0248636 0.0248636 0.0248636