condition mean min max ZT0-3 9.092365000000001 7.043855 10.423200000000001 ZT4-7 6.81651 6.81651 6.81651 ZT8-11 6.50717 6.50717 6.50717 ZT12-15 9.6147925 9.381285 9.8483 ZT16-19 10.0122 10.0122 10.0122 ZT20-23 8.83418 8.83418 8.83418