condition mean min max ZT0-3 15.542106463499998 12.322788157 18.761424769999998 ZT4-7 10.923516015499999 9.816090948 12.030941083 ZT8-11 5.601018880333333 5.411473689666667 5.790564071 ZT12-15 5.445227207833334 4.700539776 6.189914639666667 ZT16-19 5.382325322333333 4.902828521666667 5.861822123 ZT20-23 5.941481103500001 5.777434382666667 6.105527824333334