condition mean min max ZT0-3 7.38465448325 3.2472137689999996 11.5220951975 ZT4-7 17.0308147425 15.69247828 18.369151205 ZT8-11 24.871749592500002 23.668135425000003 26.075363760000002 ZT12-15 15.68230353825 10.9939114005 20.370695676 ZT16-19 17.41175051 15.72275368 19.10074734 ZT20-23 17.005037605 16.301415835 17.708659375