condition mean min max ZT0-3 20.0191 20.0191 20.0191 ZT4-7 15.705200000000001 15.705200000000001 15.705200000000001 ZT8-11 15.5145 15.5145 15.5145 ZT12-15 15.523900000000001 15.523900000000001 15.523900000000001 ZT16-19 21.89835 21.89835 21.89835 ZT20-23 20.93385 20.93385 20.93385