condition mean min max ZT0-3 0.25480975 0.1684335 0.341186 ZT4-7 0.252181 0.252181 0.252181 ZT8-11 0.08435 0.08435 0.08435 ZT12-15 0 0 0 ZT16-19 0.0840655 0.0840655 0.0840655 ZT20-23 0.5913215 0.5913215 0.5913215