condition mean min max ZT0-3 22.740037 22.740037 22.740037 ZT4-7 16.2098175 16.2098175 16.2098175 ZT8-11 22.9365575 22.9365575 22.9365575 ZT12-15 24.910667 24.910667 24.910667 ZT16-19 31.534434 31.534434 31.534434 ZT20-23 24.757962499999998 24.757962499999998 24.757962499999998