condition mean min max ZT0-3 20.6705 20.6705 20.6705 ZT4-7 15.09 15.09 15.09 ZT8-11 16.7009 16.7009 16.7009 ZT12-15 20.332900000000002 20.332900000000002 20.332900000000002 ZT16-19 25.718649999999997 25.718649999999997 25.718649999999997 ZT20-23 23.8099 23.8099 23.8099