condition mean min max ZT0-3 15.2303 15.2303 15.2303 ZT4-7 5.52658 5.52658 5.52658 ZT8-11 3.754215 3.754215 3.754215 ZT12-15 8.386054999999999 8.386054999999999 8.386054999999999 ZT16-19 20.453 20.453 20.453 ZT20-23 17.559 17.559 17.559