condition mean min max ZT0-3 1.1316967500000001 1.000796 1.2625975 ZT4-7 1.3009995 1.3009995 1.3009995 ZT8-11 0.856428 0.856428 0.856428 ZT12-15 0 0 0 ZT16-19 0.7033845000000001 0.7033845000000001 0.7033845000000001 ZT20-23 1.8414405 1.8414405 1.8414405