condition mean min max ZT0-3 11.247772 11.247772 11.247772 ZT4-7 11.139084 11.139084 11.139084 ZT8-11 11.828802 11.828802 11.828802 ZT12-15 14.2415575 14.2415575 14.2415575 ZT16-19 11.6666475 11.6666475 11.6666475 ZT20-23 11.0199225 11.0199225 11.0199225