condition mean min max ZT0-3 51.50645 51.50645 51.50645 ZT4-7 53.2238 53.2238 53.2238 ZT8-11 48.994299999999996 48.994299999999996 48.994299999999996 ZT12-15 60.058350000000004 60.058350000000004 60.058350000000004 ZT16-19 61.7585 61.7585 61.7585 ZT20-23 56.0813 56.0813 56.0813