condition mean min max ZT0-3 11.294689104916667 9.2404482765 13.348929933333332 ZT4-7 11.438363015 10.61703106 12.25969497 ZT8-11 7.59553069 4.554461485 10.636599895 ZT12-15 6.072442501166667 4.561283786333334 7.583601216 ZT16-19 5.914592084333334 5.5463798256666665 6.2828043430000005 ZT20-23 7.819853511166668 7.560699970000001 8.079007052333335