condition mean min max ZT0-3 19.79595 14.3163 25.2756 ZT4-7 22.32525 22.32525 22.32525 ZT8-11 38.9427 38.9427 38.9427 ZT12-15 0 0 0 ZT16-19 42.5643 42.5643 42.5643 ZT20-23 35.18755 35.18755 35.18755