condition mean min max ZT0-3 26.143437 26.143437 26.143437 ZT4-7 37.4520175 37.4520175 37.4520175 ZT8-11 55.053332499999996 55.053332499999996 55.053332499999996 ZT12-15 53.804961 53.804961 53.804961 ZT16-19 37.358101000000005 37.358101000000005 37.358101000000005 ZT20-23 26.2531545 26.2531545 26.2531545