condition mean min max ZT0-3 8.58619 8.58619 8.58619 ZT4-7 5.00963 5.00963 5.00963 ZT8-11 6.05067 6.05067 6.05067 ZT12-15 7.88136 7.88136 7.88136 ZT16-19 11.09695 11.09695 11.09695 ZT20-23 8.754995000000001 8.754995000000001 8.754995000000001