condition mean min max ZT0-3 3.8731400000000002 3.8731400000000002 3.8731400000000002 ZT4-7 2.83716 2.83716 2.83716 ZT8-11 2.90734 2.90734 2.90734 ZT12-15 5.68258 5.68258 5.68258 ZT16-19 2.6385 2.6385 2.6385 ZT20-23 2.1013 2.1013 2.1013