condition mean min max ZT0-3 4.0222475 3.925965 4.11853 ZT4-7 11.01773 11.01773 11.01773 ZT8-11 19.8268 19.8268 19.8268 ZT12-15 0 0 0 ZT16-19 8.770635 8.770635 8.770635 ZT20-23 8.00554 8.00554 8.00554