condition mean min max ZT0-3 0.516625 0.4681205 0.5651295000000001 ZT4-7 1.884685 1.884685 1.884685 ZT8-11 0.9504165 0.9504165 0.9504165 ZT12-15 0 0 0 ZT16-19 1.019442 1.019442 1.019442 ZT20-23 2.04879 2.04879 2.04879