condition mean min max ZT0-3 6.1136675 5.969925 6.25741 ZT4-7 4.877515 4.877515 4.877515 ZT8-11 6.43785 6.43785 6.43785 ZT12-15 0 0 0 ZT16-19 5.626659999999999 5.626659999999999 5.626659999999999 ZT20-23 6.882655 6.882655 6.882655