condition mean min max ZT0-3 8.47197 6.75545 10.188490000000002 ZT4-7 2.8178099999999997 2.8178099999999997 2.8178099999999997 ZT8-11 2.271375 2.271375 2.271375 ZT12-15 0 0 0 ZT16-19 3.53539 3.53539 3.53539 ZT20-23 4.19727 4.19727 4.19727