condition mean min max ZT0-3 12.6488001775 10.6118097 14.685790655000002 ZT4-7 19.07372755 16.406278365 21.741176735000003 ZT8-11 19.0546969075 18.290254485 19.81913933 ZT12-15 19.1911998475 15.523414119999998 22.858985575 ZT16-19 33.1188169475 31.53270366 34.704930235 ZT20-23 34.18012917 34.06995059 34.29030775