condition mean min max ZT0-3 35.5917 35.5917 35.5917 ZT4-7 34.88935 34.88935 34.88935 ZT8-11 29.53035 29.53035 29.53035 ZT12-15 29.18 29.18 29.18 ZT16-19 37.18 37.18 37.18 ZT20-23 37.03305 37.03305 37.03305