condition mean min max ZT0-3 12.944109 12.944109 12.944109 ZT4-7 13.8634385 13.8634385 13.8634385 ZT8-11 13.8529465 13.8529465 13.8529465 ZT12-15 12.5395815 12.5395815 12.5395815 ZT16-19 12.387136 12.387136 12.387136 ZT20-23 13.148171 13.148171 13.148171