condition mean min max ZT0-3 2.0361738039999997 1.8992010229999998 2.173146585 ZT4-7 1.8194090012499997 1.5539437289999998 2.0848742734999997 ZT8-11 2.4136311690000003 2.1987017155 2.6285606225 ZT12-15 6.0378685445 4.5736952945 7.5020417945 ZT16-19 6.148666767749999 6.1436654079999995 6.1536681275 ZT20-23 8.98685855075 7.8412246385 10.132492463