condition mean min max ZT0-3 0.09525410000000001 0.0769345 0.1135737 ZT4-7 0.23136600000000002 0.23136600000000002 0.23136600000000002 ZT8-11 0.30886 0.30886 0.30886 ZT12-15 0 0 0 ZT16-19 0.75709 0.75709 0.75709 ZT20-23 0.608404 0.608404 0.608404