condition mean min max ZT0-3 27.19003 27.19003 27.19003 ZT4-7 27.132180499999997 27.132180499999997 27.132180499999997 ZT8-11 30.2199475 30.2199475 30.2199475 ZT12-15 37.524283 37.524283 37.524283 ZT16-19 40.8594625 40.8594625 40.8594625 ZT20-23 33.996446 33.996446 33.996446