condition mean min max ZT0-3 11.144542 11.144542 11.144542 ZT4-7 12.019813 12.019813 12.019813 ZT8-11 11.9607285 11.9607285 11.9607285 ZT12-15 11.820980500000001 11.820980500000001 11.820980500000001 ZT16-19 12.170986500000001 12.170986500000001 12.170986500000001 ZT20-23 10.8088275 10.8088275 10.8088275