condition mean min max ZT0-3 2.4468556230000003 1.240341394 3.653369852 ZT4-7 10.92772248475 8.119438949000001 13.7360060205 ZT8-11 11.567381735249999 9.8324004255 13.302363045 ZT12-15 12.51791710975 9.2714556295 15.76437859 ZT16-19 19.598637225 15.282981455 23.914292995 ZT20-23 42.7630302575 38.902564319999996 46.623496195