condition mean min max ZT0-3 1.27167275 1.2041505 1.3391950000000001 ZT4-7 1.5702 1.5702 1.5702 ZT8-11 0.50912 0.50912 0.50912 ZT12-15 0 0 0 ZT16-19 1.80933 1.80933 1.80933 ZT20-23 1.598195 1.598195 1.598195