condition mean min max ZT0-3 2.381885 2.231185 2.532585 ZT4-7 5.570365 5.570365 5.570365 ZT8-11 1.88742 1.88742 1.88742 ZT12-15 0 0 0 ZT16-19 1.63967 1.63967 1.63967 ZT20-23 4.84629 4.84629 4.84629