condition mean min max ZT0-3 3.7337776944999996 3.497413339 3.9701420499999998 ZT4-7 6.88867790125 6.431595092 7.3457607105 ZT8-11 10.25752514 9.352672734 11.162377546 ZT12-15 28.5460561725 24.777946555 32.31416579 ZT16-19 32.202885817500004 30.142080065000002 34.26369157 ZT20-23 37.8173399775 37.09080014 38.543879815