condition mean min max ZT0-3 21.03255 21.03255 21.03255 ZT4-7 19.011200000000002 19.011200000000002 19.011200000000002 ZT8-11 18.3429 18.3429 18.3429 ZT12-15 16.92615 16.92615 16.92615 ZT16-19 23.20585 23.20585 23.20585 ZT20-23 19.98435 19.98435 19.98435