condition mean min max ZT0-3 25.231457 25.231457 25.231457 ZT4-7 32.5047115 32.5047115 32.5047115 ZT8-11 25.437003500000003 25.437003500000003 25.437003500000003 ZT12-15 29.4607815 29.4607815 29.4607815 ZT16-19 28.147654000000003 28.147654000000003 28.147654000000003 ZT20-23 45.0891935 45.0891935 45.0891935