condition mean min max ZT0-3 13.609145 12.589189999999999 14.629100000000001 ZT4-7 6.786125 6.786125 6.786125 ZT8-11 2.07219 2.07219 2.07219 ZT12-15 0 0 0 ZT16-19 2.7802599999999997 2.7802599999999997 2.7802599999999997 ZT20-23 7.0661950000000004 7.0661950000000004 7.0661950000000004