condition mean min max ZT0-3 4.257865 4.18816 4.32757 ZT4-7 4.70327 4.70327 4.70327 ZT8-11 4.7865 4.7865 4.7865 ZT12-15 0 0 0 ZT16-19 5.35561 5.35561 5.35561 ZT20-23 5.22598 5.22598 5.22598