condition mean min max ZT0-3 47.368326 47.368326 47.368326 ZT4-7 40.09922 40.09922 40.09922 ZT8-11 30.326055 30.326055 30.326055 ZT12-15 39.4385755 39.4385755 39.4385755 ZT16-19 29.250436 29.250436 29.250436 ZT20-23 27.393814 27.393814 27.393814