condition mean min max ZT0-3 8.4658 8.4658 8.4658 ZT4-7 6.802670000000001 6.802670000000001 6.802670000000001 ZT8-11 17.781100000000002 17.781100000000002 17.781100000000002 ZT12-15 28.00215 28.00215 28.00215 ZT16-19 21.850949999999997 21.850949999999997 21.850949999999997 ZT20-23 9.408445 9.408445 9.408445