condition mean min max ZT0-3 6.351331113499999 5.814294523999999 6.888367702999999 ZT4-7 5.779603186000001 4.953478671 6.605727701000001 ZT8-11 8.61270209975 7.6470700460000005 9.5783341535 ZT12-15 8.645484345 7.551093976999999 9.739874713 ZT16-19 7.519778842999999 6.445211779499999 8.5943459065 ZT20-23 13.292048175 11.729116354999999 14.854979995