condition mean min max ZT0-3 7.785625 7.785625 7.785625 ZT4-7 4.02886 4.02886 4.02886 ZT8-11 3.686675 3.686675 3.686675 ZT12-15 4.48916 4.48916 4.48916 ZT16-19 16.8008 16.8008 16.8008 ZT20-23 13.0973 13.0973 13.0973