condition mean min max ZT0-3 10.795071629583333 9.3178179095 12.272325349666666 ZT4-7 15.228444931666665 15.216904603333333 15.23998526 ZT8-11 16.10765958 14.47120721 17.74411195 ZT12-15 15.611542543333334 15.576833496666668 15.64625159 ZT16-19 15.285692215000001 15.042535149999999 15.528849280000001 ZT20-23 16.015942615 15.54489256 16.48699267