condition mean min max ZT0-3 2.4222574999999997 1.59767 3.246845 ZT4-7 2.01159 2.01159 2.01159 ZT8-11 2.0665999999999998 2.0665999999999998 2.0665999999999998 ZT12-15 0 0 0 ZT16-19 3.7621 3.7621 3.7621 ZT20-23 4.869885 4.869885 4.869885