condition mean min max ZT0-3 0.43670275000000003 0.3940945 0.47931100000000004 ZT4-7 0.3015985 0.3015985 0.3015985 ZT8-11 0.5163025 0.5163025 0.5163025 ZT12-15 0 0 0 ZT16-19 0.268289 0.268289 0.268289 ZT20-23 0.2997865 0.2997865 0.2997865