condition mean min max ZT0-3 2.4285757385 1.7736881930000001 3.083463284 ZT4-7 3.563111156 2.5308284575 4.5953938545 ZT8-11 1.71258144225 1.5815745455 1.843588339 ZT12-15 15.593032749250002 12.989295138500001 18.196770360000002 ZT16-19 15.2402154475 14.15513433 16.325296565000002 ZT20-23 12.337456108 9.668617566 15.00629465