condition mean min max ZT0-3 29.776533333333333 17.702199999999998 53.2608 ZT4-7 34.90775 34.90775 34.90775 ZT8-11 23.6993 23.6993 23.6993 ZT12-15 34.48515 27.2105 41.7598 ZT16-19 20.1919 20.1919 20.1919 ZT20-23 23.5081 23.5081 23.5081