condition mean min max ZT0-3 0.84294275 0.6012455 1.0846399999999998 ZT4-7 0.265253 0.265253 0.265253 ZT8-11 0.0854966 0.0854966 0.0854966 ZT12-15 0 0 0 ZT16-19 0.5938475 0.5938475 0.5938475 ZT20-23 0.9150699999999999 0.9150699999999999 0.9150699999999999