condition mean min max ZT0-3 21.592333333333332 13.440750000000001 27.338250000000002 ZT4-7 14.7015 14.7015 14.7015 ZT8-11 14.17475 14.17475 14.17475 ZT12-15 23.0544 22.13825 23.970550000000003 ZT16-19 24.903950000000002 24.903950000000002 24.903950000000002 ZT20-23 34.0178 34.0178 34.0178