condition mean min max ZT0-3 1.94597 1.856875 2.035065 ZT4-7 2.41277 2.41277 2.41277 ZT8-11 1.809315 1.809315 1.809315 ZT12-15 0 0 0 ZT16-19 2.6670800000000003 2.6670800000000003 2.6670800000000003 ZT20-23 2.60478 2.60478 2.60478