condition mean min max ZT0-3 0.135773 0.0 0.271546 ZT4-7 0.84968 0.84968 0.84968 ZT8-11 0.825015 0.825015 0.825015 ZT12-15 0 0 0 ZT16-19 0.274077 0.274077 0.274077 ZT20-23 2.470785 2.470785 2.470785