condition mean min max ZT0-3 24.48675 24.48675 24.48675 ZT4-7 11.7171 11.7171 11.7171 ZT8-11 5.99167 5.99167 5.99167 ZT12-15 4.379955000000001 4.379955000000001 4.379955000000001 ZT16-19 17.048 17.048 17.048 ZT20-23 20.7196 20.7196 20.7196