condition mean min max ZT0-3 3.0244075 2.87976 3.169055 ZT4-7 1.6594099999999998 1.6594099999999998 1.6594099999999998 ZT8-11 1.0281150000000001 1.0281150000000001 1.0281150000000001 ZT12-15 0 0 0 ZT16-19 2.818135 2.818135 2.818135 ZT20-23 3.75514 3.75514 3.75514