condition mean min max ZT0-3 0.244942467 0.165033617 0.324851317 ZT4-7 1.7874785164999998 1.010622325 2.5643347079999996 ZT8-11 9.08709304 6.8082165875000005 11.3659694925 ZT12-15 16.5445460575 15.842644685 17.24644743 ZT16-19 11.0497044375 8.739040555 13.36036832 ZT20-23 10.718970692500001 10.430146805 11.00779458