condition mean min max ZT0-3 5.52666 5.52666 5.52666 ZT4-7 4.696025000000001 4.696025000000001 4.696025000000001 ZT8-11 3.6684900000000003 3.6684900000000003 3.6684900000000003 ZT12-15 3.385355 3.385355 3.385355 ZT16-19 5.43401 5.43401 5.43401 ZT20-23 6.028903333333333 6.028903333333333 6.028903333333333