condition mean min max ZT0-3 3.79231 3.79231 3.79231 ZT4-7 2.522665 2.522665 2.522665 ZT8-11 3.27609 3.27609 3.27609 ZT12-15 3.748735 3.748735 3.748735 ZT16-19 5.1639800000000005 5.1639800000000005 5.1639800000000005 ZT20-23 4.2951999999999995 4.2951999999999995 4.2951999999999995