condition mean min max ZT0-3 1.125237 1.125237 1.125237 ZT4-7 0.9264675 0.9264675 0.9264675 ZT8-11 0.830594 0.830594 0.830594 ZT12-15 1.27007 1.27007 1.27007 ZT16-19 1.414705 1.414705 1.414705 ZT20-23 1.523755 1.523755 1.523755