condition mean min max ZT0-3 9.449256 9.449256 9.449256 ZT4-7 11.1687935 11.1687935 11.1687935 ZT8-11 9.0553345 9.0553345 9.0553345 ZT12-15 11.235173 11.235173 11.235173 ZT16-19 8.2245015 8.2245015 8.2245015 ZT20-23 22.3915465 22.3915465 22.3915465