condition mean min max ZT0-3 13.919977 13.919977 13.919977 ZT4-7 13.8803535 13.8803535 13.8803535 ZT8-11 11.384722 11.384722 11.384722 ZT12-15 11.242622 11.242622 11.242622 ZT16-19 11.5891785 11.5891785 11.5891785 ZT20-23 12.026425499999998 12.026425499999998 12.026425499999998