condition mean min max ZT0-3 0.03597695 0.03597695 0.03597695 ZT4-7 0.04158145 0.04158145 0.04158145 ZT8-11 0.0673785 0.0673785 0.0673785 ZT12-15 0.0411452 0.0411452 0.0411452 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0359469 0.0359469 0.0359469