condition mean min max ZT0-3 8.3803309115 6.965145173 9.79551665 ZT4-7 6.1177683927499995 5.178369709 7.0571670765 ZT8-11 16.1692275955 10.217422446 22.121032745 ZT12-15 30.162752795 28.39751399 31.9279916 ZT16-19 26.9892547025 26.942067584999997 27.03644182 ZT20-23 32.875475935 30.22978531 35.52116656