condition mean min max ZT0-3 51.612883333333336 48.13635 56.491150000000005 ZT4-7 45.58825 45.58825 45.58825 ZT8-11 48.48605 48.48605 48.48605 ZT12-15 64.71792500000001 62.8751 66.56075000000001 ZT16-19 58.90495 58.90495 58.90495 ZT20-23 54.4865 54.4865 54.4865