condition mean min max ZT0-3 4.018845000000001 4.018845000000001 4.018845000000001 ZT4-7 1.6798899999999999 1.6798899999999999 1.6798899999999999 ZT8-11 3.637735 3.637735 3.637735 ZT12-15 4.265359999999999 4.265359999999999 4.265359999999999 ZT16-19 14.13475 14.13475 14.13475 ZT20-23 11.5587 11.5587 11.5587