condition mean min max ZT0-3 52.435936 52.435936 52.435936 ZT4-7 37.4869985 37.4869985 37.4869985 ZT8-11 28.127629 28.127629 28.127629 ZT12-15 32.747043 32.747043 32.747043 ZT16-19 25.1272665 25.1272665 25.1272665 ZT20-23 31.153454 31.153454 31.153454