condition mean min max ZT0-3 9.47942 9.47942 9.47942 ZT4-7 12.9737105 12.9737105 12.9737105 ZT8-11 11.055286 11.055286 11.055286 ZT12-15 10.5550645 10.5550645 10.5550645 ZT16-19 11.890812 11.890812 11.890812 ZT20-23 11.519268 11.519268 11.519268