condition mean min max ZT0-3 40.69148333333334 22.67105 76.03825 ZT4-7 64.01294999999999 64.01294999999999 64.01294999999999 ZT8-11 20.2897 20.2897 20.2897 ZT12-15 37.284850000000006 34.1803 40.3894 ZT16-19 22.57865 22.57865 22.57865 ZT20-23 22.64425 22.64425 22.64425