condition mean min max ZT0-3 13.050705 13.050705 13.050705 ZT4-7 12.8209075 12.8209075 12.8209075 ZT8-11 12.2677045 12.2677045 12.2677045 ZT12-15 15.301184 15.301184 15.301184 ZT16-19 14.8194975 14.8194975 14.8194975 ZT20-23 13.312505 13.312505 13.312505