condition mean min max ZT0-3 17.581899999999997 17.581899999999997 17.581899999999997 ZT4-7 11.389050000000001 11.389050000000001 11.389050000000001 ZT8-11 8.362975 8.362975 8.362975 ZT12-15 16.0287 16.0287 16.0287 ZT16-19 21.956 21.956 21.956 ZT20-23 21.62995 21.62995 21.62995