condition mean min max ZT0-3 12.3033356045 3.6900049790000002 20.91666623 ZT4-7 3.4730992727500003 3.0686438445000004 3.877554701 ZT8-11 4.170417735 3.6557983265 4.685037143500001 ZT12-15 13.26871135375 8.862463937 17.674958770499998 ZT16-19 27.0681815075 25.82351747 28.312845545000002 ZT20-23 73.6652811225 43.928442524999994 103.40211972