condition mean min max ZT0-3 9.762382 9.762382 9.762382 ZT4-7 12.1049375 12.1049375 12.1049375 ZT8-11 11.609568 11.609568 11.609568 ZT12-15 10.618709500000001 10.618709500000001 10.618709500000001 ZT16-19 12.7420655 12.7420655 12.7420655 ZT20-23 13.7438735 13.7438735 13.7438735