condition mean min max ZT0-3 2.47796 2.26415 2.69177 ZT4-7 2.83477 2.83477 2.83477 ZT8-11 1.67129 1.67129 1.67129 ZT12-15 0 0 0 ZT16-19 3.319355 3.319355 3.319355 ZT20-23 3.190455 3.190455 3.190455