condition mean min max ZT0-3 20.803900000000002 20.803900000000002 20.803900000000002 ZT4-7 16.13005 16.13005 16.13005 ZT8-11 6.954955 6.954955 6.954955 ZT12-15 11.46485 11.46485 11.46485 ZT16-19 15.0864 15.0864 15.0864 ZT20-23 15.1718 15.1718 15.1718